Set 20 Muscle Physiology

Question 1

What is the sarcolemma?

Answer 1

cell membrane in muscle

Question 2

What is the sarcoplasmic reticulum?

Answer 2

stores Ca++ to be released in skeletal muscle

Question 3

What are the T-tubules?

Answer 3

sends AP to release calcium from the sarcoplasmic reticulum

Question 4

What is a myofibril?

Answer 4

actin and myosin (2:1)

Question 5

What is myosin?

Answer 5

thick fibril, H zone, myosin head attaches to ATPase

Question 6

What is actin?

Answer 6

thin fibril, F-actin filament + tropomyosin +troponin = I bands

Question 7

Where are the binding sites on actin?

Answer 7

F-actin filament

Question 8

What covers the F actin’s binding sites?

Answer 8

tropmyosin

Question 9

What binds calcium and moves tropomyosin off binding sites?

Answer 9

troponin

Question 10

What is needed for smooth muscle contraction?

Answer 10

calmodulin

Question 11

What is a sarcomere?

Answer 11

z line to z line

Question 12

What is the A band?

Answer 12

actin and myosin

Question 13

What is the H band?

Answer 13

myosin only

Question 14

What is the I band?

Answer 14

actin only

Question 15

Eccentric:

Answer 15

lengthens

Question 16

Concentric:

Answer 16

shortens

Question 17

Isometric:

Answer 17

no movement

Question 18

Isotonic:

Answer 18

joint movement and constant weight

Question 19

Isokinetic:

Answer 19

joint movement and constant weight/speed

Question 20

Motor unit:

Answer 20

single motor neuron and fibers it supplies

Question 21

Alpha fibers:

Answer 21

extrafusal

Question 22

Gamma fibers:

Answer 22

intrafusual

Question 23

What determines the strength of a muscle?

Answer 23

of fibers recruited

Question 24

What is ascites?

Answer 24

abdominal swelling

Question 25

Where are fats digested?

Answer 25

duodenum

Question 26

What is anasarca?

Answer 26

edema of the whole body