Ch. 9 Muscle Tissue And Organization

Question 1

What are the functions of the skeletal muscle 5

Answer 1

Produce skeletal movement

maintain posture and body position

regulate entering and exiting material

support soft tissue

maintain body temperature

Question 2

How is skeletal muscle attached to bone? How are muscles connected to one another? What are the connective tissue components of skeletal muscle?

Answer 2

Muscle is attached to bone by tendons

muscle connected to muscle by aponeurosis

Epimysium, perimysium, and endomysium Are the connective tissue components of skeletal muscle, they come together at the end of muscles to form tendons.

Question 3

Muscle fiber/cells

Answer 3

Are located inside the fascicle and are surrounded by an outer layer called EndoMysium. within the muscle fiber contains the myofibrils which are bunches of sarcomeres that contain Acton in myosin

Question 4

Sarcolemma

Answer 4

Plasma membrane of a muscle fiber, outer barrier of an individual muscle fiber cell. They have extensions that penetrate the muscle fiber cell called t tubules

Question 5

Sarcoplasma

Answer 5

Fluid and organelles in a muscle fiber

Question 6

Myofibrils

Answer 6

Within the muscle fiber/cell that are the contractile proteins (the contracting unit inside the myofibrils are the sarcomere)

Question 7

Myofilaments

Answer 7

Myofibrils are made of myofilaments. Mostly made of actin and myosin

Question 8

Sarcomeres

Answer 8

Are the contracting units, they are the main functioning unit of muscle fibers approximately 10,000 per myofibrils , consisting of overlapping Acton in myosin creating striations

Question 9

Z line

Answer 9

Starting and ending line Of sarcomere

Question 10

M line

Answer 10

Attachment point for myosin (thick filament)

Question 11

A band

Answer 11

Entire length of thick filaments including overlap

Question 12

Titin

Answer 12

Accessory protein of sarcomere, elastic allowing us the elasticity of skeletal muscle. Indirectly attaches thick filament to Z line

Question 13

I band

Answer 13

Region of only thin filaments. Each sarcomere and has half an i band

Question 14

H band

Answer 14

Region where there are only thick filaments

Question 15

What is the ion that plays the most important role in muscle contraction ? where is this my stored in muscle cells.

Answer 15

Calcium ions they are stored in the sarcoplasmic reticulum

Question 16

What Are the roles of the T tubules in muscle contraction

Answer 16

They are extensions of the sarcolemma that carry electrical cells through the entire muscle quickly

Question 17

What is the neuromuscular junction ? what is released at the junction and what is the motor unit?

Answer 17

The neuromuscular junction is a chemical synapse formed by the contact between motor neuron and muscle fiber. Acetylcholine ACH is released at the junction. The motor unit is a neuron and all of the muscle fibers that connects to