Bio107-ch9&10pt3 Flashcards Preview

E: BIO 107 > Bio107-ch9&10pt3 > Flashcards

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

Shortening

A

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

1
Q

Contraction

A

The muscles are doing work and shortening the sacromere

Decreasing the h zone

2
Q

Contraction ends when

A

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

3
Q

Motor unit

A

A motor neuron and all the muscle fibers it supplies

4
Q

Multiple motor unit summation (2)

A
  1. Increase the strength of the stimuli

2. Frequency of stimulation is constant

5
Q

Wave summation (2)

A
  1. Increase the frequency of the stimulus

2. Strength of the stimulus is constant

6
Q

Wave summation can cause (2)

A

Muscle spasms or tetnus

7
Q

Isometric contraction

A

Increasing force of contraction, length of muscle constant

Wall sits

8
Q

Isotonic contraction

A

Force of contraction stays constant, length of muscles decreases

Lifting weights

9
Q

Concentric contractions- isotonic

A

Muscles shortens and does work

10
Q

Eccentric contraction- isotonic

A

Muscle contracts as it lengthens

11
Q

_____ is the only source used directly for contractile activity

A

ATP

12
Q

Anaerobic glycolysis

A

Body starts breaking down a 12 carbon sugar

13
Q

Anaerobic glycolysis- if o2 present:

A

ATP will continue to produce

Glycolysis yields little ATP

14
Q

Anaerobic glycolysis- no o2 available

A

ATP production stops

Muscle builds up lactic acid

15
Q

Aerobic respiration

A

“Krebs cycle” - goes through process twice

If O2, then on to electron transport chain

Yields little ATP

16
Q

Muscles need ____ in order to work

A

ATP

17
Q

Stored ATP does not _____

A

Last long

18
Q

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

A

32-36

Glucose

19
Q

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

A

Mitochondria

ATP

20
Q

Hypertrophy

A

Increase of the muscle mass

Working out

21
Q

Atrophy

A

Decrease in the mass of a muscle