Physiology Quiz 3 (2/2) Flashcards Preview

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Flashcards in Physiology Quiz 3 (2/2) Deck (31):
0

Efferent

Carry info away from CNS

1

Motor unit

A single motor efferent nerve and the muscle cells it innervates

2

Small motor units = _______ motor activity

Fine

3

Large motor units= ______ motor activity

Gross

4

What part of the body has the smallest motor units?

Muscles controlling the eye (4 muscle cells/1 motor efferent)

5

What part of the body has the largest motor units?

Some of he trunk musculature (1000 muscle cells/1 motor efferent)

6

Concentric muscle activity

Development of force by the muscle as it shortens

7

Example of concentric muscle activity

Bringing the weight up during a bicep curl

8

Eccentric muscle activity

Development of force by the muscle as it lengthens

9

Example of eccentric muscle activity

Lowering the weight during a bicep curl

10

What type of muscle activity uses more energy? (Concentric or eccentric)

Concentric

11

Which type of muscle activity is easier to learn motor control of? (Concentric or eccentric)

Concentric

12

DOMS

Delayed onset muscle soreness

13

When does DOMS peak?

48-72 hours after activity

14

What is DOMS caused by?

Repair of microtears in series elastic element (SEE) mostly caused by eccentric activity (less often with concentric). This microtearing causes inflammation, swelling, pain, and scarring

15

Elasticity

Shortens and returns to original configuration

16

Plasticity

Stretches, but it will reach a certain point where it will not return to original configuration

17

Plasticity range

Point a series elastic element stretches to where it will still return to original configuration; any further and it will not return to original configuration

18

Is plasticity good?

Yes, it can help with flexibility

19

Series elastic element

Structures that have the property of elasticity
-tendons
-connective tissue sheaths or muscle and myofibrils
-crossbridges

20

How is force transmitted in concentric activity?

It will absorb some force and transmit the rest (think about rubber band pulling water bottle water bottle)

21

How force is transmitted during eccentric activity

Develops force because it is undergoing a stretch force and thereby adds to the force developed eccentrically

22

Source of force in concentric activity

Crossbridges

23

Source of force in eccentric activity

Crossbridge activity
SEE recoil (mostly this one)

24

Which type of muscle activity uses less energy (eccentric or concentric)

Eccentric

25

Unorganized scar

Random laying down of collagen fibrils as a scar forms
Decreases ROM
not desirable

26

Organized scar

Laying down of collagen fibrils in an organized and controlled manner
Less loss of ROM
Stretching helps develop this

27

Isometric contraction

As muscle develops force, distance between origin and insertion does not change (fibers still shorten)

28

Example of isometric contraction

Wall sit

29

Isotonic contraction

Muscle changing length but maintaining same force throughout movement

30

Isokinetic contraction

No change in velocity of movement
Likely to see change in length and force as contraction proceeds
Done on machine with a set degrees/sec