Quiz Questions

Question 1

The muscle fibers are covered by a connective tissue membrane called the:

Answer 1

endomysium

Question 2

The fibrous connective tissue that surrounds the muscle organ and is outside the epimysium and tendon is called the:

Answer 2

fascia

Question 3

The point of attachment that does not move when the muscle contracts is the:

Answer 3

origin

Question 4

The term _____ is used to describe a muscle that directly performs a specific movement.

Answer 4

agonist

Question 5

The central body portion of the muscle is the:

Answer 5

belly

Question 6

Superficial muscles are named according to:

Answer 6

location, function, shape and/or size

Question 7

The occipitofrontalis muscle can be found in the:

Answer 7

face

Question 8

The external and internal oblique muscles can be found in the:

Answer 8

abdominal wall

Question 9

Which of the following muscles are referred to as the “rotator cuff” muscles?

Answer 9

Infraspinatus, supraspinatus, subscapularis, and teres minor

Question 10

Muscles that move the wrist, hand, and fingers can be:

Answer 10

extrinsic or intrinsic.

Question 11

The tendon common to both the gastrocnemius and soleus is called the:

Answer 11

calcaneal

Question 12

The continuous low level of sustained contraction maintained by all skeletal muscles is:

Answer 12

muscle tone

Question 13

1. Which of the following is not a function of muscles?
   a. Storage
   b. Posture
   c. Heat production
   d. Movement

Answer 13

storage

Question 14

The muscle’s ability to stretch or extend and to return to its resting length is called:

Answer 14

extensibility

Question 15

The contractile unit of a muscle cell is the:

Answer 15

sacromere

Question 16

This structure allows the electrical signals to travel along the sacrolemma and move deeper into the cell.

Answer 16

transverse tubules

Question 17

The four kinds of protein that make up myofilaments are:

Answer 17

myosin, actin, tropomyosin, and troponin.

Question 18

6. According to the sliding filament theory:
   a. actin moves past myosin.
   b. myosin moves past actin.
   c. tropomyosin moves past actin.
   d. troponin moves past myosin.

Answer 18

a. actin moves past myosin.

Question 19

The energy required for muscular contraction is obtained by hydrolysis of:

Answer 19

ATP

Question 20

Anaerobic respiration results in the formation of an incompletely catabolized molecule called:

Answer 20

lactic acid

Question 21

The minimal level of stimulation required to cause a fiber to contract is called the:

Answer 21

threshold stimulus

Question 22

three phases of the twitch contraction are the

Answer 22

latent period, contraction phase, and relaxation phase.

Question 23

Repeated stimulation of muscle in time lessens its excitability and contractibility and may result in:

Answer 23

fatigue

Question 24

12. Muscle tone is maintained by:

Answer 24

negative feedback mechanisms

Question 25

A contraction in which muscle length remains the same but muscle tension increases is called:

Answer 25

an isometric contraction.

Question 26

exercises may cause an increase in muscle size called

Answer 26

hypertrophy

Question 27

The more muscle fibers contracting at the same time, the stronger the contraction of the entire muscle. The number of muscle fibers contracting depends on how many motor units are:

Answer 27

recruited