Which action is a reflex action?
Reflex Action – Solved Questions
- The first event begins with the receptor detecting a stimulus from a sensory organ. ...
- This is followed by the sensory neuron sending a signal to the relay neuron.
- The relay neuron then sends the signal to the motor neuron.
- The motor neuron sends a signal to the organ or a cell that acts to the stimuli called the effector.
What are the types of reflex?
- Biceps reflex :The jerking of forearm when biceps brachii tendon is struck with tendon hammer leads to biceps reflex. ...
- Blushing: This, perhaps doesn’t need any introduction. ...
- Corneal reflex — Refers to blinking of both eyes when the cornea of either eye is touched. ...
What is a reflexive action?
Reflex actions refer to the immediate or instantaneous response of the body to an external stimulus. The neuronal pathway that is involved in the reflex action is known as the reflex arc.
Which is an example of a reflex?
Pulling our hands away immediately after touching a hot or cold object is a classic example of a reflex action. 2. Briefly state the event that proceeds a stimulus in organisms.
What is reflex action for Class 5 examples?
Answer. Reflex action is an involuntary,unconscious action by the body in response to external stimuli. Reflex action is an immediate actiongenerated by the body in response to the environment without involvement of the brain. *As the stimulus is fired, impulses are carried out at an instance to spinal cord.
What is a reflex action short answer?
Reflex actions A reflex action is an automatic (involuntary) and rapid response to a stimulus, which minimises any damage to the body from potentially harmful conditions, such as touching something hot.
What is reflex action explain with diagram Class 10?
A reflex arc is a simple nervous pathway which is responsible for the sudden reaction known as the reflex action. The afferent/sensory neurons are present in the receptor organ which receive the stimulus. The neuron transmits the sensory information from receptor organ to the spinal cord.
What is reflex action and reflex arc explain with the help of an example?
The sudden involuntary movement in a voluntary organ; in response to a stimulus; is called reflex action. Examples of reflex action: (a) Moving your hand away from a hot iron plate. (b) Blinking of eyes. Reflex Arc: The path of electrical impulse during a reflex action is called reflex arc.
What is reflex action with an example?
Reflex action refers to the simplest form of response in the nervous system, which may be defined as the spontaneous, automatic and mechanical resp...
What are the steps of a reflex action?
1. A specific receptor, which receives stimulus from the surroundings. 2. Afferent or sensory nerve, which takes sensory impulse to the spinal cord...
What are the types of reflex action?
Types of reflex action are- I. Natural reflexes II. Conditioned reflexes
Who controls the reflex action?
Spinal cord controls reflex.
Is blinking of eyes a reflex action?
Yes, blinking of eyes is a reflex action.
Physiology of Reflex Action
i. Reflex action is a rapid, simple, automatic response to a stimulus that is not under the voluntary control of the brain. ii. It is an involuntary action. iii. It takes very less time, about a few milliseconds, to show response during reflex action. iv. Reflex action generally involves the spinal cord for quick response to a specific stimulus.
Types of Reflex Action
Natural reflex – It refers to the reflexes in which no previous learning is required, i.e., are inherited from parents or inborn or unconditioned reflexes, like salivation, swallowing, peristalsis, blinking of eyes, etc.
Reflex Action Examples
Examples of Natural Reflexes: 1. Withdrawal of hand suddenly from a hot object or if it gets pricked. 2. Coughing 3. Sneezing 4. Closing of eyelids when some particles enter the eye. 5. Shivering when it is too cold. 6. Knee-jerk reflex- This can be experienced when the area below the kneecap is tapped. a.
Reflex Arc
Reflexes are motor responses to specific sensory stimuli, and this process takes place in so less time that it can hardly be estimated when the stimulus was generated and when the action took place. These reflex actions are mediated via the reflex arc.
Importance of Reflex Action
As it is a fast action, it enables the animal to respond immediately to the harmful stimuli so that no harm is caused to it.
Summary
From the above discussion, we can conclude that there are some actions that can be controlled by the spinal cord itself. These types of actions are involuntary, i.e., not in our control. For example, if we touch a hot object, we immediately remove our hands from it.
Frequently Asked Questions (FAQs) on Reflex Action
Q.1. What is reflex action with an example? Ans: Reflex action refers to the simplest form of response in the nervous system, which may be defined as the spontaneous, automatic and mechanical response to a stimulus acting on a specific receptor without the will of an animal. E.g., Flushing of tears from our eyes when some particle enters the eye.
What is reflex arc?
Explain a reflex arc. Ans. Sudden quick action in response to something occurring in / environment is known as reflex action. Reflex action is a rapid, automatic response to a stimulus which is not under the voluntary control of the brain, i.e. it is an involuntary action. It is a simple form of behaviour in which the same stimulus produces ...
Why do animals have reflex arcs?
Reflex arcs have evolved in animals because the thinking process of brain was not fast enough during early stages of evolution.
What are some examples of reflex actions?
A reflex action occurs when the body responds to a stimulus without the involvement of the brain. Batting of eyelids and rapid withdrawal of hands from a hot surface are examples of reflex actions. The contraction of the pupils of the eyes when exposed to bright light is a perfect example of a reflex action.
Why do reflexes take longer?
In certain circumstances, the brain is bypassed for a very quick response. A response takes longer when the brain, the nerves and the spinal cord are involved. All reflex actions occur very quickly without any thinking. The action is not premeditated, and this makes it instantaneous.
How are neurons like sensory pathways?
Neurons are like sensory pathways. Millions of neurons are interconnected to make a nerve. Neural pathways make it possible for a reflect action to take place. Various muscle groups are involved in a reflex action. The first reflex actions start in the womb even before birth.
Why is reflex action important?
Reflex action is an involuntary response of effectors to the stimulus and it helps us in protecting us from any sudden stimulus which may harm us and thus takes care of the survival of an organism. It is the major point that explains the importance of reflex action. The importance of reflex action is due to the fact that reflex arcs are composed ...
What are the different types of reflexes?
To understand reflex action, we should understand all parts of the reflex arc responsible to cause a reflex action. Types of reflex action can be myotatic reflexes, tendon reflex, or reflexes observed only in human infants such as sucking reflex, and other reflexes such as abdominal reflexes or cough reflex.
What is the reflex arc?
A reflex arc is a nerve pathway through which different components like receptor, sensory neuron, interneuron, motor neuron, and effector function altogether to produce a reflex action. These components act in a five-step process to generate a reflex action that is initiated by a stimulus. It can be diagrammatically represented to make it more comprehensible. A reflex arc governs all the operations of reflexes. The types of reflex actions are also based on their functionalities and types. A reflex arc makes it possible for reflexes through the neural pathways that act on an impulse prior to reaching the brain.
What is the function of the effector cell?
It transmits nerve impulses from the brain or spinal cord out to an effector. Effector cells are muscle, organ, or gland that acts in response to a stimulus. It responds to stimulation by the motor neuron and produces a behavioral response called a reflex.
What is the neural pathway that controls the reflexes?
The reflex arc is the neural pathway controlling the reflexes and acts on an impulse even before it reaches the brain. The two types of reflex arcs are: Autonomic Reflex Arc: It affects the functioning of inner organs. Somatic Reflex Arc: It affects the functioning of muscles.
What is the reflex of the abdominal muscles to contract upon any force to the abdomen?
Grasp reflex in infants. The reflex of abdominal muscles to contract upon any force to the abdomen (Muscular defense) Knee-jerk reflex is known as a patellar reflex: when the patellar tendon is stretched, the contraction of quadriceps takes place.
How does a reflex arc work?
It can be diagrammatically represented to make it more comprehensible. A reflex arc governs all the operations of reflexes. The types of reflex actions are also based on their functionalities and types.
How to classify reflexes?
First, let's talk about the type or function of reflex. Reflexes can be classified according to the type and function of the muscles or organs that move or function because of the reflex.
What are some examples of monosynaptic reflexes?
An example of a monosynaptic reflex is the patellar (knee jerk) reflex. A multisynaptic reflex, as you can guess, is more complex. In the simplest form, a multisynaptic reflex has more than one neuron (called interneurons) within the reflex arc process.
What is the cross extensor reflex?
The crossed extensor reflex is also a multisynaptic reflex that is usually associated with a same painful stimulus, like what triggers a flexor or withdrawal reflex. In the crossed extensor reflex, the contralateral extensor muscles contract (and the ipsilateral flexor muscles are inhibited).
What is a stretch reflex?
It is a type of protective reflex where a painful stimulus triggers the contraction of flexor muscles.
How does a stretch reflex work?
A deep tendon reflex is an example of a stretch reflex. How does this work? When you're standing up, your knees bend slightly, and without the deep tendon reflex located around your knees, you could fall. That reflex will straighten your knees and keep you standing upright if you lose your balance. Aside from the knees, deep tendon reflexes are located along the outside of your elbows, in the crooks of your arms, and at your wrists and ankles. This is the same reflex that the doctor checks around your knee.
How many neurons are involved in the reflex arc?
Only one neuron involved in the reflex arc. Multiple neurons and more than one area of the central nervous system involved in the reflex arc. Example: stretch reflex. Example: withdrawal (flexor) reflex. Learning Outcomes. This lesson on reflexes is designed to prepare you to reach the following goals:
Which reflexes involve only one segment of the central nervous system?
In this classification, there are monosynaptic (or monosegmental) reflexes, which involve only one segment of the central nervous system, and multisynaptic (or intersegmental) reflexes, which involve more than one segment of the central nervous system. So, let's dive into this topic a bit more.
