Body composition can also be expressed in terms of various types of material, such as:
- Muscle
- Fat
- Bone and teeth
- Nervous tissue ( Brain and nerves)
- Hormones
- Connective tissue
- Body fluids ( blood, lymph, Urine)
- Contents of digestive tract, including intestinal gas
- Air in lungs
- Epithelium
What elements are in the human body?
Approximately 96% of body weight consists of only four elements: oxygen, carbon, hydrogen, and nitrogen. Calcium, phosphorus, magnesium, sodium, potassium, chlorine, and sulfur, are macronutrients or elements the body needs in a significant amount. Liquid oxygen is blue.
What are the basics of the human body?
The human body's 12 systems work together to ensure that we stay alive, healthy, and thrive:
- The cardiovascular (or circulatory) system transports blood, oxygen, and nutrients throughout the body.
- The digestive system takes in and processes food, and expels waste.
- The endocrine system produces hormones that regulate metabolism, growth and development, tissue function, sexual reproduction, sleep, and mood.
What are the 11 human body systems and their functions?
What are the 11 systems of the human body and their functions? The 11 organ systems include the integumentary system, skeletal system, muscular system, lymphatic system, respiratory system, digestive system, nervous system, endocrine system, cardiovascular system, urinary system, and reproductive systems.
What are the parts of the human body?
While most people are aware of the effects of air pollution on human lungs, you may not be aware of how air pollution affects other parts of your body, including your brain, heart, kidneys ...
What are the 7 structural levels of the body?
The major levels of organization in the body, from the simplest to the most complex are: atoms, molecules, organelles, cells, tissues, organs, organ systems, and the human organism.
What are the 4 structural units of the body?
Tissues, Organs, Organ Systems, and OrganismsCells. Cells are the basic structural and functional unit of all life. ... Tissues. Tissues are groups of cells that share a common structure and function and work together. ... Organs. ... Organ systems. ... Organism.
What are the 6 levels of structural organization of the body?
These include the chemical, cellular, tissue, organ, organ system, and the organism level.
What is the structural and functional unit of body?
The fundamental structural and functional unit of the body is the cell.
What is tissue in science?
tissue. Noun. cells that form a specific function in a living organism. Credits. Media Credits. The audio, illustrations, photos, and videos are credited beneath the media asset, except for promotional images, which generally link to another page that contains the media credit.
What is the digestive system?
digestive system. Noun. series of organs and glands responsible for the ingestion, digestion, and absorption of food. Also called the alimentary canal.
What are the elements that make up the human body?
Almost 99% of the mass of the human body is made up of six elements: oxygen, carbon, hydrogen, nitrogen, calcium, and phosphorus. Only about 0.85% is composed of another five elements: potassium, sulfur, so dium, chlorine, and magnesium. All 11 are necessary for life.
What are the molecules in the human body?
The composition of the human body expressed in terms of chemicals: Gases such as oxygen, carbon dioxide, nitrogen oxide, hydrogen, carbon monoxide, acetaldehyde, formaldehyde, methanethiol. These may be dissolved or present in the gases in the lungs or intestines.
What are the gases in DNA?
DNA. Dissolved inorganic ions such as sodium, potassium, chloride, bicarbonate, phosphate. Gases such as oxygen, carbon dioxide, nitrogen oxide, hydrogen, carbon monoxide, acetaldehyde, formaldehyde, methanethiol. These may be dissolved or present in the gases in the lungs or intestines.
How much water does the human body have?
The adult human body averages ~53% water. This varies substantially by age, sex, and adiposity. In a large sample of adults of all ages and both sexes, the figure for water fraction by weight was found to be 48 ±6% for females and 58 ±8% water for males. Water is ~11% hydrogen by mass but ~67% hydrogen by atomic percent, ...
What are the essential elements for life?
The elements listed below as "Essential in humans" are those listed by the (US) Food and Drug Administration as essential nutrients, as well as six additional elements: oxygen, carbon, hydrogen, and nitrogen (the fundamental building blocks of life on Earth), sulfur (essential to all cells) and cobalt (a necessary component of vitamin B 12 ).
How many elements are in a 70 kg human body?
The average 70 kg (150 lb) adult human body contains approximately 7 × 1027 atoms and contains at least detectable traces of 60 chemical elements. About 29 of these elements are thought to play an active positive role in life and health in humans.
How many elements are needed for life?
All 11 are necessary for life. The remaining elements are trace elements, of which more than a dozen are thought on the basis of good evidence to be necessary for life. All of the mass of the trace elements put together (less than 10 grams for a human body) do not add up to the body mass of magnesium, the least common of the 11 non-trace elements.
Anatomy and Physiology
Anatomy and physiology are the study of the human body. Anatomy is the study of body parts and their structures. Physiology is the study of the functions of the structures of the body. What is body structure? Body structures are the physical parts of the body. Examples of structure and function in the human body include the following:
Human Body Structure
Human body parts and their functions can be best understood by understanding the organization of the body. All living things are made of six main elements:
Human Body Analogy
In this writing activity, students will be creating an analogy for the six categories of functions in the human body. Analogies are comparisons that challenge student's creativity and writing skills. For example, a student might compare the human body to a city.
What is the human body?
The human body is a system of interacting parts with divisions dedicated to carrying out specific tasks to ensure its smooth operation and maintenance of internal conditions. Its organization is structurally hierarchical from molecules and cells up to organs and organ systems.
What are the four types of tissue?
The four tissue types in the human body are as follows: epithelial, muscle, nervous, and connective tissue. Epithelial tissue is great for building structures with walls and passageways and compartments. Muscle tissue has cells organized and coordinating together to contract and move.
What are the organs of the digestive system?
If you think about the digestive system, the organs (mouth, liver, stomach, intestines, etc.) included in it each play a crucial but distinct role in digesting our food and allowing absorption of nutrients to fuel metabolism.
What is the connective tissue?
Finally, connective tissue provides much of the physical structures and supports within the body and includes materials like cartilage, fat, bone, and blood.
What is homeostasis in the human body?
The most basic example of homeostasis is regulation of body temperature . From a young age, we know that our temperature is supposed to be 98.6 degrees Fahrenheit. A healthy human body works to keep the temperature within a narrow range, despite changes in our environment.
What is the body system that is like a highway?
The transport, or cardiovascular system, is like a highway in the city, and the control, the nervous and endocrine system is like the mayor or the government.
What is the system that brings nutrients and oxygen into our bodies?
Nutrients and oxygen are brought into our bodies for fuel (digestive and respiratory system) and waste, in terms of carbon dioxide and body fluids, are disposed (urinary, digestive, and respiratory system).
What are the major structural components of the human body?
Lipids —chiefly fats, phospholipids, and steroids —are major structural components of the human body. Fats provide an energy reserve for the body, and fat pads also serve as insulation and shock absorbers. Phospholipids and the steroid compound cholesterol are major components of the membrane that surrounds each cell.
What is the human body?
human body, the physical substance of the human organism, composed of living cells and extracellular materials and organized into tissues, organs, and systems. Human anatomy and physiology are treated in many different articles. For detailed discussions of specific tissues, organs, and systems, see human blood; cardiovascular system;
What are the biochemical constituents of the body?
For detailed coverage of the body’s biochemical constituents, see protein; carbohydrate; lipid; nucleic acid; vitamin; and hormone. For information on the structure and function of the cells that constitute the body, see cell. Many entries describe the body’s major structures.
How many organ systems are there in the human body?
Encyclopædia Britannica, Inc. See all videos for this article. The body includes nine major organ systems, each composed of various organs and tissues that work together as a functional unit.
What is the name of the chemical that carries the genetic code of the body?
Nucleic acids make up the genetic materials of the body. Deoxyribonucleic acid ( DNA) carries the body’s hereditary master code, the instructions according to which each cell operates. It is DNA, passed from parents to offspring, that dictates the inherited characteristics of each individual human.
What are the components of the cell membrane?
Like lipids, proteins are an important constituent of the cell membrane. In addition, such extracellular materials as hair and nails are composed of protein. So also is collagen, the fibrous, elastic material that makes up much of the body’s skin, bones, tendons, and ligaments.
How many types of cells are there in the human body?
Although there are some 200 different types of cells in the body, these can be grouped into four basic classes.
What are the internal parts of the human body?
Human body internal parts such as the lungs, heart, and brain, are enclosed within the skeletal system and are housed within the different internal body cavities. The spinal cord connects the brain with the rest of the body.
How many cells are there in the human body?
The average adult has somewhere between 30 – 40 trillion cells, and an estimated 242 billion new cells are produced every day. When a select group of cells with similar functions come together, it forms a tissue. Tissues cumulate into organs, organ systems and eventually, an individual organism.
What is the study of the human body?
Human Anatomy is the scientific study of form and shapes of human beings. The skeleton also protects several vital organs such as the heart, lungs and the liver. Bones are attached to other bones through ligaments, a fibrous connective tissue. Joints are points at which two bones meet.
What are the five organ systems?
These five crucial human body parts are the brain, heart, liver, lungs and kidneys.
What is the digestive system?
Digestive System. A diagram of the human digestive system detailing various components. The digestive system breaks down food and assimilates nutrients into the body, which the body then uses for growth and cell repair. The major components of the digestive system are: Mouth. Teeth.
What is the cranial cavity?
The cranial cavity is the space within the skull, it protects the brain and other parts of the central nervous system. The lungs are protected in the pleural cavity.
What is the distribution of the nervous system?
Distribution of Nerves in humans (top) and the Neuron (bottom) The central nervous system contains the brain and the spinal cord, while the peripheral nervous system includes nerves and ganglia that are present outside the brain and spinal cord. Through the axons, every part of the body gets connected.
What are the two parts of the skeletal system?
The skeletal system is composed of bones and cartilages. There are two parts of the skeleton; axial and appendicular. The axial skeleton consists of the bones of the head and trunk. The appendicular skeleton consists of the bones within the limbs, as well as supporting pectoral and pelvic girdles.
What are the three types of muscles?
The muscular system consists of all the body muscles. There are three muscle types; smooth, cardiac and skeletal muscles. Smooth muscle is found within walls of blood vessels and hollow organs such as the stomach or intestines. Cardiac muscle cells form the heart muscle, also called the myocardium.
What is the peripheral nervous system?
The peripheral nervous system definition is that it conducts information from the CNS to the target tissues, and from the target tissues to the CNS. It consists of nerves and their ganglia. Nerves that carry information from peripheral sense organs (for example eye, tongue, nasal mucosa, ear, skin) to the CNS are called the ascending, afferent or sensory nerve fibers. Fibers that carry information from the CNS to the periphery (muscles and glands) are the descending, efferent, motor or secretory nerve fibers.
What is the nervous system?
Nervous system. Nervous system controls how we interact with and respond to our environment, by controlling the function of the organs in our other body systems. The nervous system organs are the brain, spinal cord and sensory organs. These are connected by neurons, which act to transmit neural signals around the body.
What is the digestive system?
Digestive system - anterior view. The human body is a biological machine made of body systems; groups of organs that work together to produce and sustain life. Sometimes we get lost while studying about cells and molecules and can’t see the forest for the trees.
What is the cardiovascular system?
The cardiovascular system is comprised of the heart and the circulatory system of blood vessels. The heart is composed of four chambers; two atria and two ventricles. Blood enters the heart through the upper chambers of the left and right atria and exits via the left and right ventricles.
What are the respiratory systems?
Respiratory system. The respiratory system consists of a series of organs; the nasal cavity, pharynx, larynx, trachea, bronchi, bronchioles and lungs ( alveoli ). The nasal cavity and pharynx are together called the upper respiratory system, while the remainder of the organs comprise the lower respiratory system.
