Muscular System

Question 1

What is the order of the skeletal muscle structure from simple to complex

Answer 1

Muscle fiber(cell), Endomysium, Muscle Fascicle, Perimysium, Epimysium, Muscle Body`

Question 2

Why do skeletal muscle cells have so many nuclei?

Answer 2

Essential for protein production

Question 3

What are muscle cells made of?

Answer 3

Myofibrils

Question 4

Lengthwise segments of myofibrils are

Answer 4

Sarcomeres

Question 5

What is the perimysium?

Answer 5

Connective tissue layer around fascicle

Question 6

What is the endomysium?

Answer 6

Deepest layer of connective tissue that surrounds individual fibrils

Question 7

What is the epimysium?

Answer 7

Connective tissue that encases the entire muscle body

Question 8

What are myofilaments?

Answer 8

Two different types of protein strands

Question 9

What are the two myofilaments?

Answer 9

Actin and Myosin

Question 10

Physical characteristics of Actin

Answer 10

Skinny

Question 11

Physical characteristics of Myosin

Answer 11

Thick with golf club-like studded

Question 12

What is Ca 2+ (Calcium ion) role in muscle contraction

Answer 12

Binds to Actin proteins to encourage Myosin head attachment to Actin strands

Question 13

What are the two proteins entwined with the Actin?

Answer 13

Troponin and tropomyosin

Question 14

Purpose of troponin and tropomyosin

Answer 14

Act as insulation of Actin to prevent Myosin heads from touching

Question 15

What do myofibrils store?

Answer 15

Glycogen

Question 16

What is the plasma membrane surrounding each muscle fiber called?

Answer 16

Sarcolemma

Question 17

What happens to Muscle cell membrane when stimulus is applied

Answer 17

Becomes more permeable to sodium which diffuses inwards and makes inside positive

Question 18

Describe Depolarization

Answer 18

Stimulus applied to membrane makes it permeable to sodium which allows it to diffuse inwards and make inside postive

Question 19

Describe Repolarization:

Answer 19

Sodium channels close, Potassium channels open and K+ diffuses out of the cell. (Active Transport)

Question 20

What happens when an impulse reaches the end of motor neuron?

Answer 20

Vesicles release acetylcholine into Synaptic cleft

Question 21

What is the role of acetylcholine?

Answer 21

To stimulate receptors in the sarcolemma which will send the impulse to the T-tubules and into the sarcoplasmic reticulum

Question 22

3 energy storage compounds located inside the muscle

Answer 22

1. Myoglobin
2. Glycogen
3. Fatty acids

Question 23

3 organs that generate creatine phosphate

Answer 23

1. Liver
2. Kidneys
3. Pancreas