Set 20 Muscle Physiology Flashcards Preview

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Flashcards in Set 20 Muscle Physiology Deck (26):
1

What is the sarcolemma?

cell membrane in muscle

2

What is the sarcoplasmic reticulum?

stores Ca++ to be released in skeletal muscle

3

What are the T-tubules?

sends AP to release calcium from the sarcoplasmic reticulum

4

What is a myofibril?

actin and myosin (2:1)

5

What is myosin?

thick fibril, H zone, myosin head attaches to ATPase

6

What is actin?

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

7

Where are the binding sites on actin?

F-actin filament

8

What covers the F actin's binding sites?

tropmyosin

9

What binds calcium and moves tropomyosin off binding sites?

troponin

10

What is needed for smooth muscle contraction?

calmodulin

11

What is a sarcomere?

z line to z line

12

What is the A band?

actin and myosin

13

What is the H band?

myosin only

14

What is the I band?

actin only

15

Eccentric:

lengthens

16

Concentric:

shortens

17

Isometric:

no movement

18

Isotonic:

joint movement and constant weight

19

Isokinetic:

joint movement and constant weight/speed

20

Motor unit:

single motor neuron and fibers it supplies

21

Alpha fibers:

extrafusal

22

Gamma fibers:

intrafusual

23

What determines the strength of a muscle?

# of fibers recruited

24

What is ascites?

abdominal swelling

25

Where are fats digested?

duodenum

26

What is anasarca?

edema of the whole body