Deck 22: Muscle Physiology

Question 1

A tracing of the muscle's electrical activity is an ________.

A) EOG
B) EEG
C) ECG
D) EMG

Answer 1

D

Question 2

What are sensors that are placed on the skin to detect the electrical activity by a muscle?

A) electrodes
B) action potentials
C) impulse
D) none of the above

Answer 2

A

Question 3

In an isotonic contraction, the muscle ________.

A) does not change length, but increases in tension
B) changes in length and moves the "load"
C) rapidly resynthesizes ATP
D) never converts pyruvate to lactic acid

Answer 3

B

Question 4

Most lever systems in the human body are ________.

A) second class
B) first class
C) fourth class
D) third class

Question 5

If L=load, F=fulcrum, and AF=applied force, what type of lever system is described as LAFF?

A) third-class lever system
B) second-class lever system
C) fourth-class lever system
D) first-class lever system

Question 6

The strongest muscle contractions are normally achieved by ________.

A) increasing the stimulus above threshold
B) increasing the stimulus above the treppe stimulus
C) recruiting small and medium muscle fibers
D) increasing stimulation up to the maximal stimulus

Question 7

The ________ phase of muscle contractions occurs as AChE inactivates ACh and calcium ions are returned to the sarcoplasmic reticulum.

A) myogram
B) latent period
C) relaxation
D) contraction phase

Question 8

Which ion flows into the cell during depolarization?

A) calcium
B) sodium
C) protein
D) potassium

Question 9

Most muscle work is accomplished by ________.

A) treppe
B) incomplete tetanus
C) wave summation
D) complete tetanus

Question 10

The warm-up period required of athletes in order to bring their muscles to peak performance is called ________.

A) twitch
B) treppe
C) incomplete tetanus
D) wave summation

Question 11

Immediately following the arrival of a stimulus at the skeletal muscle cell there is a short period called the ________ period during which the events of excitation-coupling occur.

A) latent
B) refractory
C) relaxation
D) contraction

Question 12

ATP is used for ________ in muscle contraction.

A) power stroke
B) the release of calcium from the sarcoplasmic reticulum
C) binding of the myosin and actin
D) none of the above

Question 13

The main effect of treppe, as the muscle contraction increase in strength, is to ________.

A) increase the myoglobin content
B) convert glycogen to glucose
C) tone the muscles
D) enhance the availability of calcium

Question 14

What type of muscle contraction occurs while you are holding a book?

A) treppe
B) myogram
C) isotonic
D) isometric

Question 15

Muscle and nerve tissues produce electrical impulses called ________.

A) depolarization
B) repolarization
C) neurotransmitters
D) action potentials

Question 16

A(n) ________ muscle contraction occurs when the muscle length is relatively constant, but the muscle tension changes.

A) isotonic
B) complete tetanus
C) wave summation
D) isometric

Question 17

What is the major factor controlling how levers work?

A) the difference in the positioning of the effort, load, and fulcrum
B) the direction of the load is being moved
C) the structural characteristics of the muscles of the person using the lever
D) the weight of the load

Question 18

What is the main factor that determines the power of a muscle?

A) the length
B) the total number of muscles cells available for contraction
C) the shape
D) the number of neurons innervating the muscle

Question 19

Which type of lever is demonstrated by using scissors?

A) fourth-class lever
B) first-class lever
C) second-class lever
D) third-class lever

Question 20

What controls the force of muscle contraction?

A) treppe
B) wave summation
C) multimotor unit recruitment
D) concentric contractions

Question 21

The measurement of power is ________.

A) EMG
B) EOG
C) motor unit recruitment
D) dynamometry