Which of the following muscles acts under voluntary control?

Question

BlackTom AI · Accepted Answer

Question restatement: Which of the following muscles acts under voluntary control?

Option 1: 'muscle of the stomach wall' — The muscles here are smooth muscles that line the stomach and are controlled involuntarily by the autonomic nervous system. This makes this option incorrect for voluntary control.

Option 2: 'muscle in the wall of the heart' — The heart is made of cardiac muscle, whose activity is intrinsic and regulated by specialized conduction pathways; it is not under conscious, voluntary control. This option is therefore incorrect for voluntary control.

Option 3: 'muscle that extends the elbow' — This refers to skeletal muscles such as the triceps brachii, which are attached to bones and innervated by motor neurons enabling voluntary movements. This option correctly represents a muscle under voluntary control.

Option 4: 'muscle in the bladder wall' — The bladder wall contains smooth muscle that contracts involuntarily as part of autonomic nervous system regulation to expel urine, not subject to voluntary control. This option is incorrect for voluntary control.

Summary of reasoning: The key distinction lies in muscle types. Skeletal muscles (like those extending the elbow) are under conscious control, whereas smooth and cardiac muscles (stomach wall, heart, bladder wall) operate involuntarily. Therefore, the only option that aligns with voluntary motor control is the muscle that extends the elbow.

Which of the following muscles acts under voluntary control?单项选择题

类似问题

The muscles of respiration are composed of Blank ______.

位置16的问题 Smooth muscle is found in internal organs.TrueFalse

Which of the following muscle groups has sarcomeres and is involuntary?

Cardiac muscle is

Match the structure in the body with the appropriate type of muscle it is made from. Left ventricle of the heart Cardiac muscle Oblique muscle of the stomach Smooth muscle Gluteus maximus Skeletal muscle Arrector pili Smooth muscle Zygomaticus Skeletal muscle

What type of muscle assists an agonist by causing a like movement or by stabilizing a joint over which an agonist acts?

Which type of muscle is voluntary?

更多留学生实用工具

智能学习助手

风格化写作助手

论文查重助手

文献引用助手

课堂转译助手

课堂笔记助手

Quiz搜索助手

学校历年真题

智能刷题助手

智能匹配练习

希望你的学习变得更简单