Microscopic Muscle Anatomy

Question 1

What do skeletal muscles do?

Answer 1

connect to bones in your body and facilitate movement

Question 2

List the order of the muscle from big to small

Answer 2

muscle, fascile, myocyte, myofibril, sarcomere

Question 3

What is a tendon?

Answer 3

connects skeletal muscle to skeleton

Question 4

What is epimysium?

Answer 4

connective tissue that surrounds the whole muscle

Question 5

What is a fasicle?

Answer 5

smaller units in whole muscle that holds muscle cells

Question 6

What is perimysium?

Answer 6

connective tissue that surrounds the fascicle

Question 7

What is endomysium?

Answer 7

connective tissue that surrounds each myocyte

Question 8

What is a myocyte?

Answer 8

a muscle cell = a muscle fiber

Question 9

What is a myofibril?

Answer 9

a long string/line inside of a muscle cell, that has sarcomeres from end to end

Question 10

What is a sarcomere?

Answer 10

a contractile unit of a myofibril

Question 11

Does the body create more myocytes?

Answer 11

No

Question 12

What does the body do to grow?

Answer 12

It adds more myofibrils and sarcomeres

Question 13

What is hypertrophy? What happens to myofibrils?

Answer 13

enlargement of tissue when cells get bigger; myofibrils get more dense

Question 14

What is hyperplasia? What happens to myofibrils?

Answer 14

enlargement of tissue when the number of cells increase; more myofirbrils get added

Question 15

What are tendons mostly made of?

Answer 15

collagen

Question 16

What can tendons do across rough bone projections?

Answer 16

Slide

Question 17

What is a common tendon? What does it connect?

Answer 17

Achilles tendon; connects calf muscles (gastroc and soleus) to heel (calcaneous)

Question 18

What are the two regions of a sarcomere?

Answer 18

Thin and thick filament

Question 19

What does thin filament connect to, and what does it have?

Answer 19

Z-line and actin

Question 20

What does thick filament connect to, and what does it have?

Answer 20

m-line, and myosin

Question 21

What does myosin do? What does it use?

Answer 21

Myosin grabs onto actin and pulls it; it uses one ATP molecule per step

Question 22

What runs along the thin filament?

Answer 22

tropomyosin and troponin

Question 23

What blocks the active site on thin filament?

Answer 23

tropomyosin

Question 24

What binds to what on the thin filament? What does this do and allow?

Answer 24

Calcium binds to troponin, which moves tropomyosin, and allows the myosin to bind to the active site, and move actin