Bio107-ch9&10pt1&2 Flashcards Preview

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Flashcards in Bio107-ch9&10pt1&2 Deck (31):
0

Characteristics of muscle (4)

1. Excitability- responds to stimuli
2. Contractibility- able to shorten
3. Extensibility- stretches when pulled
4. Elasticity- returns to original shape after movement

1

Functions of muscle (3)

1. Motion/ movement
2. Maintain posture
3. Heat production

2

Muscle tissue types (3)

1. Skeletal muscle tissue
2. Cardiac muscle tissue
3. Smooth muscle tissue

3

Skeletal muscle tissue (4)

1. Biceps triceps
2. Voluntary
3. Striated
4. Multinucleated

4

Cardiac muscle tissue (4)

1. Heart
2. Involuntary
3. Striated- intercalated discs
4. Multinucleated

5

Smooth muscle tissue (4)

1. Around organs, arrector pilli
2. Involuntary
3. NO STRIATIONS
4. ONE nucleus

6

Agonist

Does work

7

Antagonist

Does not do work

8

Synergistic muscles

Muscles that have the same action at a joint

9

Prime mover- agonist

Muscle with the greatest force of contraction or mechanical advantage

10

Synergists

Non Prime movers

11

Prime movers____ to cause desired action

Contract

12

Antagonists ____ and yield to _____

Stretches
Prime mover

13

Synergists ____ to stabilize nearby joints

Contract

14

Fixators ____ the origin of the prime mover

Stabilize

15

Resistance

Weight of a body part or object

16

Effort

Work done by muscle contraction

17

Skeletal muscle myofibril image:
1 sacromere =

From z disc to z disc

18

Actin

Thin filament

19

H zone

Down the middle, in between both z discs

Collapses during activity

20

A band

Area between both I bands

One end of myosin to the other, contains both actin and myosin

21

Myosin

Thick filament

22

M line

The middle

23

I band

One sacromere to the end of another

Contains actin only

24

Smaller units of skeletal muscle fibers are

Myofibrils

25

Thick filament has ____ that move ____

Heads
Move up and down back and forth

26

Actin contains (2)

Tropomysin and troponin

27

Sarcolemma stores

Calcium

28

Sarcolemma and T tubules surround

The myofibril

29

Sarcoplasmic reticulum

1. Mesh-like
2. Stores Ca for muscle contraction
3. Paired terminal cisternae form cross channels
4. Elongate T tubules allow Ca to flow or be stored

30

Excitation-contraction coupling, also called

Sliding filament theory