What two events can cause the Arrector pili to contract?
- Protection: Protects against abrasions and UV light.
- Sensation: Has sensory receptors to detect heat/cold/touch/pressure/pain.
- Temperature regulation: The amount of blood flow and sweating regulates body temp.
What stimulates arrector pili?
Anatomical terms of muscle Each arrector pili is composed of a bundle of smooth muscle fibres which attach to several follicles (a follicular unit), and is innervated by the sympathetic branch of the autonomic nervous system. The contraction of the muscle is then involuntary–stresses such as cold, fear etc.
What will happen when the arrector pili muscle contract?
The arrector pili muscle is a tiny muscle connected to each hair follicle and the skin. When it contracts it causes the hair to stand erect, and a "goosebump" forms on the skin. The hair follicle is a tube-shaped sheath that surrounds the part of the hair that is under the skin and nourishes the hair.
What happens when the arrector pili muscles contract quizlet?
What occurs when the arrector pili muscles contract? Your hair stands!! Also known as Goosebumps that appear on skin.
What supplies the energy for muscle contraction?
Adenosine triphosphate (ATP) is the source of energy for all muscle contractions.