Chapter 7 lesson 3

Question 1

Isotonic

Answer 1

Force is produced, muscle tension is developed, and movement occurs through a given range of motion. Isotonic muscle actions are subdivided into concentric and eccentric muscle actions.

Question 2

Isometric

Answer 2

Muscle tension is created without a change in muscle length and no visible movement of the joint.

Question 3

Isokinetic

Answer 3

The speed of movement is fixed, and resistance varies with the force exerted.

It requires sophisticated training equipment often seen in rehabilitation or exercise physiology laboratories.

Question 4

Eccentric muscle action

Answer 4

A muscle action that occurs when a muscle develops tension while lengthening.

Question 5

Motor unit

Answer 5

A motor neuron and all of the muscle fibers that it innervates.

Question 6

Concentric muscle action

Answer 6

A muscle action that occurs when a muscle is exerting force greater than the resistive force, resulting in a shortening of the muscle.

Question 7

Isometric muscle action

Answer 7

When a muscle is exerting force equal to the force being placed on it leading to no visible change in the muscle length.

Question 8

Core

Answer 8

The structures that make up the lumbo-pelvic-hip complex (LPHC), including the lumbar spine, pelvic girdle, abdomen, and hip joint.

Question 9

Muscle action spectrum

Answer 9

The full range of eccentric, isometric, and concentric muscle contractions required to perform a movement.

Question 10

What are the three overarching types of muscle actions?

Answer 10

Isotonic, isometric, and isokinetic