Bio107-ch9&10pt3

Question 0

Shortening

Answer 0

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

Question 1

Contraction

Answer 1

The muscles are doing work and shortening the sacromere

Decreasing the h zone

Question 2

Contraction ends when

Answer 2

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

Question 3

Motor unit

Answer 3

A motor neuron and all the muscle fibers it supplies

Question 4

Multiple motor unit summation (2)

Answer 4

1. Increase the strength of the stimuli

2. Frequency of stimulation is constant

Question 5

Wave summation (2)

Answer 5

1. Increase the frequency of the stimulus

2. Strength of the stimulus is constant

Question 6

Wave summation can cause (2)

Answer 6

Muscle spasms or tetnus

Question 7

Isometric contraction

Answer 7

Increasing force of contraction, length of muscle constant

Wall sits

Question 8

Isotonic contraction

Answer 8

Force of contraction stays constant, length of muscles decreases

Lifting weights

Question 9

Concentric contractions- isotonic

Answer 9

Muscles shortens and does work

Question 10

Eccentric contraction- isotonic

Answer 10

Muscle contracts as it lengthens

Question 11

_____ is the only source used directly for contractile activity

Answer 11

ATP

Question 12

Anaerobic glycolysis

Answer 12

Body starts breaking down a 12 carbon sugar

Question 13

Anaerobic glycolysis- if o2 present:

Answer 13

ATP will continue to produce

Glycolysis yields little ATP

Question 14

Anaerobic glycolysis- no o2 available

Answer 14

ATP production stops

Muscle builds up lactic acid

Question 15

Aerobic respiration

Answer 15

“Krebs cycle” - goes through process twice

If O2, then on to electron transport chain

Yields little ATP

Question 16

Muscles need ____ in order to work

Answer 16

ATP

Question 17

Stored ATP does not _____

Answer 17

Last long

Question 18

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

Answer 18

32-36

Glucose

Question 19

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

Answer 19

Mitochondria

ATP

Question 20

Hypertrophy

Answer 20

Increase of the muscle mass

Working out

Question 21

Atrophy

Answer 21

Decrease in the mass of a muscle