Physiology Lab Test 33454

149 Questions | By Marissabree | Updated: Apr 17, 2023 | Attempts: 34

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1.

When cardiac muscle contracts what happens
- A.
  
  Blood circulates, delivering nutrients to cells and removing cell waste
- B.
  
  Changes the internal diameter of hollow organs
- C.
  
  Moves the entire body in its environement
2.

Where is smooth muscle located
- A.
  
  Heart
- B.
  
  Walls of hollow organs
- C.
  
  Attached to skeleton
3.

Which of the following are true of smooth muscle(more then one answer)
- A.
  
  Found in intestines
- B.
  
  Changes the internal diameter of hollow organs
- C.
  
  Found in lungs
- D.
  
  Found in blood vessels
- E.
  
  Helps us move
- F.
  
  Is attached to bone
4.

What is the primary function of muscle
- A.
  
  To help us move
- B.
  
  To produce ATP
- C.
  
  To convert chemical energy to mechanical work
- D.
  
  To convert mechanical work to chemical energy
5.

Human skeletal muscles consist of hundreds of what
6.

Fibers are bound together by what
7.

Skeletal muscles are stimulated to contract by what
- A.
  
  Sensory motor nerves
- B.
  
  CNS
- C.
  
  Autonomic nerves
- D.
  
  Somatic motor nerves
8.

Somatic motor nerves carry signals in the form of nerve impulses from the brain or spinal cord to the skeletal muscles
- A.
  
  True
- B.
  
  False
9.

What are axons
- A.
  
  Muscle fibers
- B.
  
  Nerve fibers
- C.
  
  Collagen fibers
- D.
  
  Bone fibers
10.

Axons leave the spinal cord via what
11.

Axons leave the brain via what
12.

Axons are distributed to appropriate skeletal muscles in the form of what
13.

Upon reaching the muscle, each nerve fiber branches and innervates one individual muscle fiber
- A.
  
  True
- B.
  
  False
14.

Each muscle fiber is innervated by how many motor neurons
- A.
  
  Two
- B.
  
  One
- C.
  
  Hundreds
- D.
  
  Ten
15.

The combination of a single motor neuron and all the muscle fibers it controls is called what
- A.
  
  Motor neuron
- B.
  
  Neuron unit
- C.
  
  Muscle fiber
- D.
  
  Motor unit
16.

When a somatic motor neuron is activated , all of the muscle fibers it innervates respond to the neurons impulses by generating their own electrical signals that lead to contraction of the activated muscle fiber
- A.
  
  True
- B.
  
  False
17.

The size of the motor unit arrangment of a skeletal muscle is determined by what
- A.
  
  Function and location in the body
- B.
  
  The size of it
- C.
  
  The function and size
- D.
  
  Location in body and size
18.

The smaller the size of a muscles motor unit the less the number of neurons needed for control of the muscles
- A.
  
  True
- B.
  
  False
19.

Physiologically the degree of skeletal muscle contraction is controlled by what (more then one answer)
- A.
  
  Increasing the strength of each nerve fiber in the muscle
- B.
  
  Activating a desired number of motor units within the muscle
- C.
  
  Controlling the frequency and strength of motor neuron impulses in all the motor units
- D.
  
  Controlling the frequency of motor neurons impulses in each motor unit
20.

What is tonus
- A.
  
  A constant state of slight tension that serves to maintain the muscle in a state of readiness
- B.
  
  A fluctuating state of slight tension that serves to maintain the muscle in a state of readiness
- C.
  
  Changing in the state of muscle strength
- D.
  
  When the brain increases the number of simultaneously active motor units within the muscle
21.

The source of signals detected by the EMG Electrodes is when the motor neuron is activated, the component muscle fibers generate and conduct their own electrical impulses that ultimatley result in contraction of the fibers
- A.
  
  True
- B.
  
  False
22.

An electromyography is the detection, amplication, and recording of changes in the skin voltaged produced by underlying skeletal muscle contraction
- A.
  
  True
- B.
  
  False
23.

What is tetany
- A.
  
  The sustained fusion of individual muscle twitches
- B.
  
  Application of a force that results in the movement of an object
- C.
  
  The sustained fusion of many muscle twitches
- D.
  
  The flucuating fusion of many muscle twitches
24.

Most human skeletal muscles are composed of one motor units
- A.
  
  True
- B.
  
  False
25.

The brain determines the number of active motor units required for a muscle to perform a given task by doing what (more then one answer)
- A.
  
  Utilizing sensory information from stretch receptors in the muscle
- B.
  
  Utilizing motor information from stretch receptors in the muscle
- C.
  
  Utilizing sensory information from stretch receptors in the joint capsules
- D.
  
  Utilizing sensory information from stretch receptors in associated tendons
- E.
  
  Utilizing sensory information from stretch receptors in the brain