Exam Review: Muscles (Chapters 9 & 10)

15 Questions | By Jennie.mcdonald | Updated: Mar 22, 2022 | Attempts: 99

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Exam Review: Muscles (Chapters 9 & 10) - Quiz

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1.

Given these structures: 1. Whole muscle 2. Muscle fibers 3. Myofilaments 4. Myofibrils 5. Muscle Fascicles Choose the correct order from largest to smallest.
- A.
  
  1, 2, 5, 3, 4
- B.
  
  1, 2, 5, 4, 3
- C.
  
  1, 5, 2, 3, 4
- D.
  
  1, 5, 2, 4, 3
2.

Given these events: 1) Calcium ions combine with tropomyosin 2) Calcium ions combine with troponin 3) Tropomyosin pulls away from actin 4) Troponin pulls away from actin 5) Tropomyosin pulls away from myosin 6) Troponin pulls away from myosin 7) Myosin binds to actin Choose the arrangement that lists the correct events in the order they occur in muscle contraction.
- A.
  
  1, 4, 7
- B.
  
  2, 5, 6
- C.
  
  2, 3, 7
- D.
  
  1, 3, 7
3.

During the depolarization phase of an action potential, the permeability of the plasma membrane to
- A.
  
  Ca²⁺ increases
- B.
  
  Na⁺ increases
- C.
  
  K⁺ increases
- D.
  
  Na⁺ decreases
4.

Calcium binds on troponin on the [Blank] myofilaments
5.

A weightlifter attempts to lift a weight from the floor, but the weight is so heavy that he is unable to move it. The type of muscle contraction the weightlifter is using is mostly
- A.
  
  Concentric
- B.
  
  Isometric
- C.
  
  Isotonic
- D.
  
  Isokinetic
6.

Which statement about muscles and muscle contraction is false?
- A.
  
  ATP is required for the cycle of cross-bridge formation, movement, and release.
- B.
  
  Muscle tissue shortens forcefully but lengthens passively.
- C.
  
  The H zone contains only actin myofilaments
- D.
  
  Type II muscle fibers respond rapidly to nervous stimulation.
7.

What are the main contributors of negative charges within a muscle cell?
- A.
  
  Sodium Ions
- B.
  
  Chloride Ions
- C.
  
  Proteins
- D.
  
  Potassium Ions
8.

If a muscle is stretched too far, fewer cross-bridges can form.
- A.
  
  True
- B.
  
  False
9.

Head movement at the atlantooccipital joint is an example of a Class [Blank] lever.
10.

Factors that increase the number of cross-bridges and therefore increase the force of muscle contraction. (Multiple answers; select all that apply).
- A.
  
  Larger muscle fiber diameter
- B.
  
  Increased number of muscle fibers
- C.
  
  More myofibrils
- D.
  
  Frequency of stimulation
- E.
  
  Muscle length at time of contraction
11.

Given these events: (1) The sarcoplasm reticulum releases Ca+ (2) The sarcoplasm reticulum takes up Ca+ (3) Ca+ ions diffuse into the sarcoplasm (4) An AP moves down the T-tubule (5) The sarcomere shortens (6) The muscle relaxes Choose the arrangement that lists the events in the order they occur following a single stimulation.
- A.
  
  1, 3, 4, 5, 2, 6
- B.
  
  2, 3, 5, 4, 6, 1
- C.
  
  4, 1, 3, 5, 2, 6
- D.
  
  4, 2, 3, 5, 1, 6
12.

Of these, which is the greatest source of ATP?
- A.
  
  Creatine kinase
- B.
  
  Anaerobic respiration
- C.
  
  Aerobic Respiration
- D.
  
  Myokinase
13.

The part of the sarcomere that A (green) refers to is the _______________.
- A.
  
  M line
- B.
  
  A band
- C.
  
  I band
- D.
  
  Z disk