Physio Chapter 12 Part 2

Question 1

Skeletal muscles respire anaerobically first ______ sec of moderate to heavy exercise.

Cardiopulmonary system requires this amount of time to increase _____ supply to exercising muscles

Answer 1

45-90, Oxygen

Question 2

Maximum rate of oxygen consumption (V02 max) determined by age, gender, and size, this is called?

Answer 2

maximum oxygen uptake

Question 3

During light exercise:
Most energy is derived from __________ of fatty acids.

During moderate exercise:
Energy is derived equally from _____ and ______.

During heavy exercise:
Glucose supplies _____ of the energy for muscles.
Liver increases glycogenolysis.

Answer 3

aerobic respiration, fatty acids/glucose, 2/3

Question 4

During exercise, the _______ carrier protein is moved to the muscle cell’s plasma membrane

Answer 4

GLUT-4

Question 5

Oxygen that was withdrawn from hemoglobin and myoglobin during exercise.
Extra 02 required for metabolism tissue warmed during exercise, O2 needed for metabolism of lactic acid produced during anaerobic respiration, this is known as….

Answer 5

oxygen debt

Question 6

When person stops exercising, rate of ________ does not immediately return to pre-exercise levels

Answer 6

oxygen uptake

Question 7

Phosphocreatine (creatine phosphate) is the rapid source of ______ renewal in skeletal muscle. _____ combines with creatine phosphate.

Answer 7

ATP, ADP

Question 8

Red fibers, high oxidative capacity for aerobic respiration, resistant to fatigue, have rich capillary supply, numerous mitochondria/aerobic enzymes, high myoglobin,

what kind of fibers display these characteristics?

Answer 8

slow twitch

Question 9

White fibers.
Adapted to respire anaerobically.
Have large stores of glycogen.
Have few capillaries.
Have few mitochondria.
Extraocular muscles that position the eye.

What fibers display these characteristics?

Answer 9

Fast Twitch fibers

Question 10

These fibers display great aerobic ability and are resistant to fatigue

Answer 10

Intermediate fibers

Question 11

Any exercise induced reduction in the ability to maintain muscle to generate force or power, this is called?

Answer 11

muscle fatigue

Question 12

During moderate exercise fatigue occurs when slow-twitch fibers deplete their _______.
These fibers? are recruited, converting glucose to lactic acid, they interfere with Ca transport

Answer 12

glycogen reserves, fast twitch

Question 13

Muscle fatigue caused by changes in CNS rather than fatigue of muscles themselves, this is called?

Answer 13

central fatigue

Question 14

Maximum 02 uptake during strenuous exercise:
In adult aged 20-25, averages ____ml of 02/min.

In trained endurance athlete increases up to ___ ml of 02/min.

Answer 14

50 ml, 86 ml

Question 15

In the adaptation of muscles to exercise training, there is an increase in the lactate threshold with produces ______ lactic acid.
This also lowers the depletion of ______ stores.

Answer 15

less, glycogen