Question 1

Which of the following is required near actin and myosin in order to initiate muscle contraction?

Accepted Answer

A) ATP 
B) calcium 
C) phosphate 
D) calcium and ATP 
E) calcium and phosphate 
A) ATP 
B) calcium 
C) phosphate 
D) calcium and ATP 
E) calcium and phosphate

Question 2

The movement of actin and myosin fibers is described by all of the following except

Accepted Answer

A) the resulting myosin head attaches to the actin filament. 
B) myosin rolls up from one end,forming a ball. 
C) the myosin filament advances relative to the actin filament. 
D) the globular myosin head detaches from the actin filament. 
E) the myosin head returns to its original conformation. 
A) the resulting myosin head attaches to the actin filament. 
B) myosin rolls up from one end,forming a ball. 
C) the myosin filament advances relative to the actin filament. 
D) the globular myosin head detaches from the actin filament. 
E) the myosin head returns to its original conformation.

Question 3

Which of the following regarding bone growth is false?

Accepted Answer

A) Cartilage of growth plates actively grow in lengthwise direction. 
B) Increase in bone thickness results from the adding of bone layers on top of the periosteum. 
C) Some cartilage remains after it is replaced by bone. 
D) Cartilage calcification encroaches on the cartilaginous growth plate. 
A) Cartilage of growth plates actively grow in lengthwise direction. 
B) Increase in bone thickness results from the adding of bone layers on top of the periosteum. 
C) Some cartilage remains after it is replaced by bone. 
D) Cartilage calcification encroaches on the cartilaginous growth plate.

Question 4

Select the incorrect statement related to muscles and muscle fibers.

Accepted Answer

A) Muscle fibers are composed of myofibrils. 
B) Myofibrils are components of segments known as Z lines. 
C) Stacks of thick myofibrils produce dark bands,called the A band. 
D) I bands are composed of thin myofilaments. 
E) Sacromeres are the smallest subunits of muscle contraction. 
A) Muscle fibers are composed of myofibrils. 
B) Myofibrils are components of segments known as Z lines. 
C) Stacks of thick myofibrils produce dark bands,called the A band. 
D) I bands are composed of thin myofilaments. 
E) Sacromeres are the smallest subunits of muscle contraction.

Question 5

In bone,crystals of calcium phosphate impregnate the extracellular matrix containing fibers of

Accepted Answer

A) actin. 
B) cellulose. 
C) collagen. 
D) myosin. 
E) troponin. 
A) actin. 
B) cellulose. 
C) collagen. 
D) myosin. 
E) troponin.

Question 6

Which of the following proteins is not associated with muscle contraction?

Accepted Answer

A) tropomyosin 
B) fibrinogen 
C) actin 
D) myosin 
E) troponin 
A) tropomyosin 
B) fibrinogen 
C) actin 
D) myosin 
E) troponin

Question 7

The myosin heads form a cross bridge with the neighboring actin filaments.The energy for the cross-bridge cycle and muscle contraction is provided by

Accepted Answer

A) pyruvate. 
B) lactic acid. 
C) ATP. 
D) NADH. 
E) glucosE. 
A) pyruvate. 
B) lactic acid. 
C) ATP. 
D) NADH. 
E) glucosE.

Question 8

A cross bridge is the binding of which two proteins?

Accepted Answer

A) actin and myosin 
B) actin and troponin 
C) myosin and troponin 
D) collagen and troponin 
E) myosin and collagen 
A) actin and myosin 
B) actin and troponin 
C) myosin and troponin 
D) collagen and troponin 
E) myosin and collagen

Question 9

During a contraction in the smooth muscle,the calcium ions in the sarcoplasmic reticulum bind to the protein called

Accepted Answer

A) troponin. 
B) tropomyosin. 
C) myosin. 
D) calmodulin. 
E) actinomyosin. 
A) troponin. 
B) tropomyosin. 
C) myosin. 
D) calmodulin. 
E) actinomyosin.

Question 10

Production of lactic acid by muscles contributes to a lack of muscle force called

Accepted Answer

A) muscle tension. 
B) muscle fatigue. 
C) muscle breakdown. 
D) muscle cramps. 
E) muscle failurE. 
A) muscle tension. 
B) muscle fatigue. 
C) muscle breakdown. 
D) muscle cramps. 
E) muscle failurE.

Question 11

Which of the following is required to detach myosin from actin?

Accepted Answer

A) calcium 
B) ATP 
C) phosphate 
D) troponin 
E) tropomyosin 
A) calcium 
B) ATP 
C) phosphate 
D) troponin 
E) tropomyosin

Question 12

What is the association between tropomyosin and troponin molecules in resting striated muscle fibers?

Accepted Answer

A) Tropomyosin holds the troponin in place on the myosin. 
B) Troponin holds the tropomyosin in place on the myosin. 
C) Tropomyosin holds the troponin in place on the actin. 
D) Troponin holds the tropomyosin in place on the actin. 
E) There is no known association. 
A) Tropomyosin holds the troponin in place on the myosin. 
B) Troponin holds the tropomyosin in place on the myosin. 
C) Tropomyosin holds the troponin in place on the actin. 
D) Troponin holds the tropomyosin in place on the actin. 
E) There is no known association.

Question 13

Which of these muscles has the greatest proportion of slow-twitch fibers?

Accepted Answer

A) the gastrocnemius 
B) the soleus 
C) the lateral rectus 
D) chicken breast muscle 
A) the gastrocnemius 
B) the soleus 
C) the lateral rectus 
D) chicken breast muscle

Question 14

Impulses conducted along the transverse tubules of the muscle fiber stimulate the release of

Accepted Answer

A) ATP. 
B) the binding of actin and myosin. 
C) tropomyosin and troponin binding. 
D) calcium ions. 
E) acetylcholinE. 
A) ATP. 
B) the binding of actin and myosin. 
C) tropomyosin and troponin binding. 
D) calcium ions. 
E) acetylcholinE.

Exam 47: The Musculoskeletal System

Which of the following is required near actin and myosin in order to initiate muscle contraction?

The movement of actin and myosin fibers is described by all of the following except

Which of the following regarding bone growth is false?

Select the incorrect statement related to muscles and muscle fibers.

In bone,crystals of calcium phosphate impregnate the extracellular matrix containing fibers of

Which of the following proteins is not associated with muscle contraction?

The myosin heads form a cross bridge with the neighboring actin filaments.The energy for the cross-bridge cycle and muscle contraction is provided by

A cross bridge is the binding of which two proteins?

During a contraction in the smooth muscle,the calcium ions in the sarcoplasmic reticulum bind to the protein called

Production of lactic acid by muscles contributes to a lack of muscle force called

Which of the following is required to detach myosin from actin?

What is the association between tropomyosin and troponin molecules in resting striated muscle fibers?

Which of these muscles has the greatest proportion of slow-twitch fibers?

Impulses conducted along the transverse tubules of the muscle fiber stimulate the release of

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