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What part of the nervous system stimulates the arrector pili muscles and give you goosebumps?
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 therefore involuntary - stresses such as cold, fear etc. may stimulate the sympathetic nervous system and thus cause contraction, but the muscle is not under conscious control.
What Neurotransmitter diffuses across a synapse to a muscle cell?
It varies: In the somatic system (skeletal muscle) and parasympathetic branch of the autonomous nervous system (smooth & cardiac muscle) it is usually acetylcholine. In the sympathetic branch of the autonomous nervous system (smooth & cardiac muscle) it is usually norepinephrine (also called noradrenaline). There are exceptions, but this is the general rule.
The involuntary muscles are controlled by what?
The involuntary muscles are primarily composed of smooth muscle and specialized striated muscle known as cardiac muscle. All skeletal muscle is under voluntary control. Hence, the involuntary muscles are under control of the autonomic nervous system, which can be further divided into the sympathetic and parasympathetic divisions. The sympathetic division is readying the body into action, hence the "fight or flight" response associated with it, and the parasympathetic division associated with "rest and digest". :)
How does smooth muscle make blood vessels function?
Smooth muscle is mostly in the afferent branch going from the arteries to the arterioles. The body controls where blood will flow by controlling the vessel diameter. An increase in sympathetic tone constricts smooth muscle, decreases blood vessel diameter, and limits blood flow.
What does noradrenaline do?
It can cause vascular smooth muscle contraction
What will the sympathetic nervous system do to the cardic muscle?
Sympathetic nervous system activation will increase the frequency and force of cardiac myocyte contractility
What will sympathetic stimulation of the eye do?
Sympathetic stimulation of the eye will cause dilation of the pupil (mydriasis) and relaxation of the ciliary muscle for far vision.
Does sympathetic and parasympathetic nerves supply voluntary skeletal muscles?
No, sympathetic and parasympathetic nerves do not supply voluntary skeletal muscles. These nerves primarily innervate smooth muscle, cardiac muscle, and glands, helping to regulate involuntary functions in the body. Voluntary skeletal muscles are under the control of the somatic nervous system.
What controls smooth muscle movement?
The sympathetic and parasympathetic nervious system.
Which muscle do you control smooth muscle or skeletal muscle?
You are in direct control of skeletal muscle.
What types of muscle cells branch?
Muscle tissue
Which structures would not be innervated by the sympathetic nervous system A. skeletal muscle B. glands C. smooth muscle D. cardiac muscle?
skeletal muscles
