Question 1

Both multiunit and single-unit smooth muscle are under motor control from the autonomic nervous system.

Accepted Answer

A) True 
 B)False

Question 2

Indicate which type of muscle is associated with the property in question by writing the appropriate letter in the blank using the answer code below:
-Is innervated by motor neurons.

Accepted Answer

A) skeletal muscle only 
B) single-unit smooth muscle only 
C) cardiac muscle only 
D) skeletal muscle and cardiac muscle 
E) skeletal muscle and single-unit smooth muscle
F)single-unit smooth muscle and cardiac muscle
G)skeletal, single-unit smooth, and cardiac muscles

Question 3

Slow-oxidative muscle fibers would be found in high density in the leg muscles of Olympic sprinters.

Accepted Answer

A) True 
 B)False

Question 4

MATCHING
Indicate which of the muscle proteins in skeletal muscle is associated with the item in question by writing the appropriate letters in the blanks using the answer code below:
-Found in thin filament.

Accepted Answer

A) actin only 
B) myosin only 
C) actin and myosin 
D) troponin-tropomyosin complex 
E) actin, troponin, and tropomyosin
F)actin, myosin, troponin, and tropomyosin

Question 5

Of the step in excitation-contraction below, which occurs before the others?

Accepted Answer

A)  exposed actin sites bind with myosin cross bridges. 
B)  sodium channels open in the fiber's membrane. 
C)  calcium is released from the sarcoplasmic reticulum. 
D)  troponin binds calcium. 
E)  attachment of ATP allows for cross bridge detachment.

Question 6

During excitation-contraction coupling,

Accepted Answer

A)  the action potential travels down the transverse tubules. 
B)  Ca2+ is released from the sarcoplasmic reticulum. 
C)  Ca2+ is taken up by the sarcoplasmic reticulum. 
D)  both (a) and (b) above are correct. 
E)  all of these answers.

Question 7

Which of the following statements concerning cross bridges is not correct? Cross bridges

Accepted Answer

A)  cross bridges bind to actin during muscle contraction. 
B)  cross bridges are formed by the globular heads of the myosin molecules. 
C)  formation is tied to Cl- levels in the cytosol 
D)  cross bridges bend during muscle contraction. 
E)  cross bridges protrude from the thick filaments.

Question 8

The metabolic capability of a muscle fiber can affect the degree of tension it can develop.

Accepted Answer

A) True 
 B)False

Question 9

Which of the following muscle types are myogenic?

Accepted Answer

A)  cardiac muscle 
B)  single-unit smooth muscle 
C)  skeletal muscle 
D)  both (a) and (b) above. 
E)  all of these answers.

Question 10

Indicate which type of muscle is associated with the property in question by writing the appropriate letter in the blank using the answer code below:
-Is found in the heart.

Accepted Answer

A) skeletal muscle only 
B) single-unit smooth muscle only 
C) cardiac muscle only 
D) skeletal muscle and cardiac muscle 
E) skeletal muscle and single-unit smooth muscle
F)single-unit smooth muscle and cardiac muscle
G)skeletal, single-unit smooth, and cardiac muscles

Question 11

MATCHING
Indicate which of the muscle proteins in skeletal muscle is associated with the item in question by writing the appropriate letters in the blanks using the answer code below:
-Lie(s) near the groove of the thin filament helix.

Accepted Answer

A) actin only 
B) myosin only 
C) actin and myosin 
D) troponin-tropomyosin complex 
E) actin, troponin, and tropomyosin
F)actin, myosin, troponin, and tropomyosin

Question 12

Indicate which type of muscle is associated with the property in question by writing the appropriate letter in the blank using the answer code below:
-Is found in the walls of hollow organs such as the stomach.

Accepted Answer

A) skeletal muscle only 
B) single-unit smooth muscle only 
C) cardiac muscle only 
D) skeletal muscle and cardiac muscle 
E) skeletal muscle and single-unit smooth muscle
F)single-unit smooth muscle and cardiac muscle
G)skeletal, single-unit smooth, and cardiac muscles

Question 13

In smooth muscle, Ca²? binds with the protein ____________________, which is structurally similar to troponin.

Accepted Answer

The answer of In smooth muscle, Ca²? binds with the...

Question 14

The Z line of the sarcomere is characterized by

Accepted Answer

A)  overlapping thin and thick filaments. 
B)  only thick filaments. 
C)  only thin filaments. 
D)  a very dark coloration. 
E)  none of these answers.

Question 15

Indicate which of the characteristics in question apply to each of the muscle fiber types by using the following answer code (more than one answer may apply):
-Has the largest diameter.

Accepted Answer

A) slow-oxidative fiber 
B) fast-oxidative fiber 
C) fast-glycolytic fiber

Question 16

Muscle fibers develop tension by

Accepted Answer

A)  contraction of sarcomeres. 
B)  shortening. 
C)  the pushing of myosin by actin. 
D)  both (a) and (b) above. 
E)  none of these answer.

Question 17

MATCHING
Indicate which of the muscle proteins in skeletal muscle is associated with the item in question by writing the appropriate letters in the blanks using the answer code below:
-Posses cross bridges.

Accepted Answer

A) actin only 
B) myosin only 
C) actin and myosin 
D) troponin-tropomyosin complex 
E) actin, troponin, and tropomyosin
F)actin, myosin, troponin, and tropomyosin

Question 18

Indicate which type of muscle is associated with the property in question by writing the appropriate letter in the blank using the answer code below:
-Has a clear-cut length-tension relationship.

Accepted Answer

A) skeletal muscle only 
B) single-unit smooth muscle only 
C) cardiac muscle only 
D) skeletal muscle and cardiac muscle 
E) skeletal muscle and single-unit smooth muscle
F)single-unit smooth muscle and cardiac muscle
G)skeletal, single-unit smooth, and cardiac muscles

Question 19

Which type of muscle contains the most actin?

Accepted Answer

A)  skeletal 
B)  smooth 
C)  cardiac 
D)  all of the above contain approximately the same amount

Question 20

Indicate which characteristic applies to which type of muscle.
-Muscle tension exceeds the load.

Accepted Answer

A) isometric contraction 
B) isotonic contraction

Exam 8: Muscle Physiology

Both multiunit and single-unit smooth muscle are under motor control from the autonomic nervous system.

Indicate which type of muscle is associated with the property in question by writing the appropriate letter in the blank using the answer code below: -Is innervated by motor neurons.

Slow-oxidative muscle fibers would be found in high density in the leg muscles of Olympic sprinters.

MATCHING Indicate which of the muscle proteins in skeletal muscle is associated with the item in question by writing the appropriate letters in the blanks using the answer code below: -Found in thin filament.

Of the step in excitation-contraction below, which occurs before the others?

During excitation-contraction coupling,

Which of the following statements concerning cross bridges is not correct? Cross bridges

The metabolic capability of a muscle fiber can affect the degree of tension it can develop.

Which of the following muscle types are myogenic?

Indicate which type of muscle is associated with the property in question by writing the appropriate letter in the blank using the answer code below: -Is found in the heart.

MATCHING Indicate which of the muscle proteins in skeletal muscle is associated with the item in question by writing the appropriate letters in the blanks using the answer code below: -Lie(s) near the groove of the thin filament helix.

Indicate which type of muscle is associated with the property in question by writing the appropriate letter in the blank using the answer code below: -Is found in the walls of hollow organs such as the stomach.

In smooth muscle, Ca²? binds with the protein ____________________, which is structurally similar to troponin.

The Z line of the sarcomere is characterized by

Indicate which of the characteristics in question apply to each of the muscle fiber types by using the following answer code (more than one answer may apply) : -Has the largest diameter.

Muscle fibers develop tension by

MATCHING Indicate which of the muscle proteins in skeletal muscle is associated with the item in question by writing the appropriate letters in the blanks using the answer code below: -Posses cross bridges.

Indicate which type of muscle is associated with the property in question by writing the appropriate letter in the blank using the answer code below: -Has a clear-cut length-tension relationship.

Which type of muscle contains the most actin?

Indicate which characteristic applies to which type of muscle. -Muscle tension exceeds the load.