Part Two- Muscle Tissue

Question 0

What are fasicles?

Answer 0

Bundles of small fibers that make up a muscle

Question 1

Muscle tissue

Answer 1

1) voluntary ( skeletal muscles)
Under conscious control/ fast moving/ red fibers/ straided muscle fibers

2) involuntary ( smooth)
Not under conscious control/ slow moving/ white fibers/ smooth muscle fibers ( stomach, intestine and bladder)

3) cardiac
Not under conscious control, fast moving, red fibers, straided muscle fibers, rhythmic pace and regular strength.

Question 2

Straided muscle fibers?

Answer 2

Within the fasicle are thinner fibers called myofibrils
Myofibril is made of thick and thin contractil filaments
Main component in thick myofilament is protein myosin
Thin myofilaments= proteins actin and tropomyosin
Alteration of think and thin myofilaments gives skeletal muscle fibers striped appearance

Question 3

What is tropomyosin ?

Answer 3

Thin myofilament protein

Has the ability to inhibit contractions

Question 4

Contraction

Answer 4

Relaxed muscle- think and thin myofilaments are lengthened and overlap
During contraction- thick myofilaments slide farther in between the thin myofilaments and draw closer together. The action shortens both the myofibrils and the whole muscle fiber.
More shortened- bigger the contraction