FREE NURSING AND STUDY GAMES ABOUT CHAPTER 9

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FREE NURSING AND STUDY GAMES ABOUT CHAPTER 9

EXAM QUESTIONS

Actual Qs and Ans Expert-Verified Explanation

This Exam contains:

-Guarantee passing score -135 Questions and Answers -format set of multiple-choice -Expert-Verified Explanation Question 1: Muscle fibers generally have only one motor end plate, but a single motor neuron can innervate many different muscle fibers in a group. How does this arrangement affect muscle contraction?

Answer:

A signal from one motor neuron can potentially stimulate multiple fibers in a group to contract, generating more force.

Question 2: What change occurs with aging?

Answer:

almost half of muscle mass has atrophied (wasted away)

Question 3: What causes the striated appearance of skeletal muscle fibers?

Answer:

Organization of components of the sarcomeres Question 4: During strenuous exercise, when muscles are not being supplied with enough oxygen, a shift in metabolism results in the breakdown of pyruvic acid to lactic acid. What is this change in metabolism called?

Answer:

lactic acid threshold

Question 5: What four pairs of muscles are considered muscles of mastication?

Answer:

temporalis

medial pterygoid

masseter

lateral pterygoid Question 6: Match muscles responsible for forearm movements (at the elbow joint) to their actions.flexion extension rotation

Answer:

flexion - biceps brachii & brachioradialis extension - triceps brachii rotation - supinator & pronator quadratus Question 7: Glycolysis is used to produce ATP for muscle contraction and is best described as

______.

Multiple choice question.aerobic breakdown of glucose to produce ATP anaerobic breakdown of glucose to produce ATP conversion of ADP to ATP using energy from creatine phosphate

Answer:

anaerobic breakdown of glucose to produce ATP Question 8: What has happened in someone with myasthenia gravis that causes them to have muscle weakness?

Answer:

Decreased number of acetylcholine receptors

Question 9: A skeletal muscle fiber is ______.

a long, cylindrical structure made of several individual muscle cells a single muscle cell a cord of connective tissue that connects a fascicle to a tendon a bundle of muscle cells

Answer:

a single muscle cell Question 10: What generates the force that shortens the sarcomeres to bring about muscle contraction?ATP binding to myosin heads cross-bridges dissociating from actin filaments troponin pulling on the tropomyosin myosin cross-bridges pulling on the actin filaments

Answer:

myosin cross-bridges pulling on the actin filaments Question 11: A motor unit is comprised of a ______ and the ______ that it controls.Multiple choice question.the axon of a motor neuron; a single muscle fiber motor neuron; muscle fibers muscle fiber; motor neuron

Answer:

motor neuron; muscle fibers Question 12: Why are athletes typically able to exercise longer before developing muscle fatigue than non-athletes?

Answer:

Due to training, athletes have a better blood supply and more mitochondria in their muscles than do non-athletes.Question 13: During muscle relaxation, calcium levels in the sarcoplasm fall because ______.calcium is actively transported into the extracellular space calcium diffuses into the sarcoplasmic reticulum calcium is actively transported into the sarcoplasmic reticulum calcium diffuses into the extracellular space

Answer:

calcium is actively transported into the sarcoplasmic reticulum Question 14: The product of glycolysis, pyruvic acid, is converted to ______ when oxygen is not available.water carbon dioxide lactic acid

Answer:

lactic acid

Question 15: What term describes the more movable end of a muscle?

Answer:

insertion