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Exam 8: Muscular System

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Question 71

Multiple Choice

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Consider a muscle that originates on the posterior femur and inserts on the posterior tibia. What is the action of this muscle?

A) To flex the knee
B) To flex the hip
C) To extend the knee
D) To extend the hip

E) A) and B)
F) A) and C)

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Question 72

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As you go to lift your backpack off of the floor, there is a period of time when the muscles of your arm and back are contracting but your backpack has yet to move. The muscles are developing tension before they begin to shorten and before the bag begins to be lifted. This type of contraction is called an __________ contraction.

A) isotonic
B) isometric

C) A) and B)
D) undefined

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Question 73

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After death, rigor mortis develops as levels of calcium in the sarcoplasm increase and levels of __________ decrease.

Skeletal muscle cells appear striated because of the presence of what parallel bundles?

Following stenuous exercise, levels of ATP, creatine phosphate, oxygen, and glucose must be returned to normal levels. This situation, called __________, may take several hours to complete.

The enlargement of muscle fibers as a result of exercise is called _______________.

In skeletal muscle, the thick filaments are mainly composed of ___________.

For the biceps brachii, triceps brachii, and the quadriceps femoris, what is referred to by the prefixes "bi-", "tri-", and "quad-"?

ATP is necessary for muscle relaxation.

Acetylcholinesterase breaks down the cross-bridge linkages between myosin to actin.

Muscles that assist a prime mover in causing a movement are called _______________.

A muscle that will adduct the thigh (moving it toward the midline of the body) will be located in what area?

What are fascicles?

Which muscles share the same primary action?

A muscle that will adduct the thigh (moving it toward the midline of the body) will be located in what area?

One factor that may contribute to the development of muscle fatigue is an accumulation of the __________ resulting from anaerobic metabolism.

After death, rigor mortis develops as levels of calcium in the sarcoplasm increase and levels of __________ decrease.

What binds to actin at its binding sites, allowing the formation of cross-bridges?

What type of muscle fiber is large in diameter and contains abundant glycogen and relatively few mitochondria?

What is the product of the aerobic breakdown of glucose?