Question

b.1.3.1: the body uses different types of muscular contractions to create movement and stability. each type of contraction has a different function. 15. describe the three types of muscle: skeletal - smooth - cardiac - 16. what are the 5 characteristics of muscle (pg 282) 17. types of muscle fiber type and relate this to motor units: (pg 284) type 1 - type 2a - type 2x -

Explanation:

1. Skeletal muscles are attached to bones and are under voluntary control, enabling movement. Smooth muscles are found in internal organs like the digestive tract and blood vessels, and are involuntary. Cardiac muscle is specific to the heart, involuntary, and contracts rhythmically to pump blood.
2. The five characteristics of muscle are excitability (respond to stimuli), contractility (shorten and generate force), extensibility (stretch), elasticity (return to original length), and conductivity (transmit electrical impulses).
3. Type 1 muscle fibers, also known as slow - twitch fibers, are fatigue - resistant and have a high oxidative capacity. They are part of small motor units and are used for endurance activities. Type 2a fibers are intermediate, with both oxidative and glycolytic capabilities, and are part of larger motor units, used for activities like sprinting. Type 2x fibers, or fast - twitch glycolytic fibers, are powerful but fatigue quickly, part of large motor units, and used for short - burst, high - intensity activities.

Answer:

15.
Skeletal: Attached to bones, voluntary, enable movement.
Smooth: In internal organs, involuntary.
Cardiac: In heart, involuntary, pumps blood.

1. Excitability, contractility, extensibility, elasticity, conductivity.

17.
Type 1: Slow - twitch, fatigue - resistant, for endurance, in small motor units.
Type 2a: Intermediate, for sprint - like activities, in larger motor units.
Type 2x: Fast - twitch, powerful but fatigues quickly, in large motor units.