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JudyAlthough the experts don't agree on how many muscles there are in the human body, they do agree that the smallest muscle is the stapedius. Located in the middle ear, the stapedius is a mere 1.27 millimetres long. And what does such a miniscule muscle do? It controls the tiniest bone in the body, the stapes or stirrup bone. The stapes and two other bones conduct sound vibrations through the middle ear.
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What is a twitch contraction?
A twitch contraction is a single, brief contraction of a muscle fiber in response to a stimulus. It is the smallest unit of muscle contraction and is not strong enough to produce movement of a limb.
What is the smallest cranial nerve?
The smallest cranial nerve is the trochlear nerve (CN IV). It is responsible for controlling the superior oblique muscle of the eye, which helps with downward and inward eye movement.
What are the 5 levels of organism in the body from smallest to biggest?
The five levels of organization in the body from smallest to largest are cells (e.g., muscle cell), tissues (e.g., muscle tissue), organs (e.g., heart), organ systems (e.g., cardiovascular system), and the whole organism (e.g., human).
Is the muscle in the iris of the eye is voluntary muscle?
No, the human eye is an organ. However, each eye has six muscles that control its movements: the lateral rectus, the medial rectus, the inferior rectus, the superior rectus, the inferior oblique, and the superior oblique.
A twitch is in response to a single action potential?
A twitch is a single contraction-relaxation cycle of a muscle fiber in response to a single action potential. It is the smallest unit of muscle contraction and can be summed together to produce larger muscle contractions.
