18 Questions
Which muscle is the prime mover of hip flexion?
Iliopsoas
What is the function of the gluteus maximus muscle?
Extending the hip when power is needed
Which muscle acts as a synergist to bring about the cross-legged position?
Sartorius
Which muscle group is a prime mover of thigh extension and knee flexion?
Hamstring group
What is the main function of the adductor muscles?
Abduct or press the thighs together
Where are vastus lateralis and rectus femoris sometimes used as sites for intramuscular injections?
Thigh
During muscle contraction, what happens to the thin actin filaments?
They slide toward each other
What occurs to the I bands during muscle contraction?
They decrease in size dramatically
What is the function of Troponin during muscle contraction?
Binds to calcium
What characterizes an isotonic muscle contraction?
Muscle becomes shorter but tension remains the same
Which phase of contraction involves the muscle cell shortening due to myosin pulling (power stroke)?
Contraction Phase
What happens to the H zone during muscle contraction?
It disappears
What type of muscle arrangement is characterized by fascicles inserting into only one side of the tendon?
Unipennate
Which muscle covers the frontal bone and is responsible for raising the eyebrow and wrinkling the forehead?
Frontalis
Which facial muscle is known as the 'kissing muscle' and allows for closing the mouth and protruding the lips?
Orbicularis Oris
What function does the Buccinator muscle serve?
Flattens the cheek as in whistling
Which muscle acts synergistically with the Masseter in closing the jaw?
Temporalis
Which muscle pulls the corner of the mouth inferiorly, producing a downward sag of the mouth?
Platysma
Learn about the different types of muscle pennation including unipennate, bipennate, and multipennate. Explore the anatomy of head and neck muscles, as well as facial muscles such as Frontalis, Orbicularis Oculi, and Orbicularis Oris.
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