Bio107-ch9&10pt3 Flashcards Preview

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Flashcards in Bio107-ch9&10pt3 Deck (22):
0

Contraction

The muscles are doing work and shortening the sacromere

Decreasing the h zone

1

Shortening

Occurs when the tension generated by the cross bridge exceeds forces opposing shortening

2

Contraction ends when

The cross bridge becomes inactive, the tension generated declines, and relaxation is induced

3

Motor unit

A motor neuron and all the muscle fibers it supplies

4

Multiple motor unit summation (2)

1. Increase the strength of the stimuli
2. Frequency of stimulation is constant

5

Wave summation (2)

1. Increase the frequency of the stimulus
2. Strength of the stimulus is constant

6

Wave summation can cause (2)

Muscle spasms or tetnus

7

Isometric contraction

Increasing force of contraction, length of muscle constant

Wall sits

8

Isotonic contraction

Force of contraction stays constant, length of muscles decreases

Lifting weights

9

Concentric contractions- isotonic

Muscles shortens and does work

10

Eccentric contraction- isotonic

Muscle contracts as it lengthens

11

_____ is the only source used directly for contractile activity

ATP

12

Anaerobic glycolysis

Body starts breaking down a 12 carbon sugar

13

Anaerobic glycolysis- if o2 present:

ATP will continue to produce

Glycolysis yields little ATP

14

Anaerobic glycolysis- no o2 available

ATP production stops

Muscle builds up lactic acid

15

Aerobic respiration

"Krebs cycle" - goes through process twice

If O2, then on to electron transport chain

Yields little ATP

16

Muscles need ____ in order to work

ATP

17

Stored ATP does not _____

Last long

18

All 3 systems produce ____-____ ATP per _____ that we break down

32-36
Glucose

19

The more _____ a muscle has, the more ____ can be produced

Mitochondria
ATP

20

Hypertrophy

Increase of the muscle mass

Working out

21

Atrophy

Decrease in the mass of a muscle