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kramer
2 years ago
11

Need help with this please

Biology
1 answer:
wolverine [178]2 years ago
3 0

Answer: movement is always voluntary

Explanation:

Muscles are contractile:

- Contractility is the ability of muscle cells to forcefully shorten. Think of having the ability to flex a muscle.

Muscles are excitable:

- Excitable tissue can conduct or transmit electrical impulses. Basically, it can react to stimulus, which may be delivered from a motor neuron or a hormone. For example, the hormone epinephrine helps muscles to produce force.

Muscles respond to stimulus:

- well since muscles are an excitable tissue, they can react to stimulus. (see answer above)

————————

Muscle movement is NOT always voluntary:

- Some muscle movement is voluntary, which means it is under conscious control. For example, a person decides to open a book and read. Other movements are involuntary, meaning they are not under conscious control, such as the contraction of your pupil in bright light, breathing, blinking, your heart beating, etc.

- Therefore, the correct answer is:

movement is always voluntary

hope this helps :)

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