Skeletal Muscle 1

Question 1

The human body has more than ____ skeletal muscles

Answer 1

400

Question 2

Skeletal muscle make up ___ of total body weight and ___ of total metabolism

Answer 2

40%; 20%

Question 3

Skeletal muscle is know as the bodies _____ or ____

Answer 3

furnace; engine

Question 4

What is skeletal muscle is an important reservoir of?

Answer 4

Water, amino acids, and carbohydrates

Question 5

The low energy requirements at rest?

Answer 5

10 - 15 kcal kg-1 day-1

Question 6

The high energy output during exercise?

Answer 6

1.0 – 1.5 kcal kg-1 min-1

Question 7

What is the energy to force percentage?

Answer 7

25%

Question 8

T OR F: Skeletal muscle is capable of high speed, power, endurance, and force at the same time.

Answer 8

False

Question 9

What are the fuel sources and waste products?

Answer 9

Fuel sources: Carbohydrates and fats Waste: water, CO2, and heat

Question 10

T or F: A muscle fibre is made up of multiple cells

Answer 10

False. Each fibre is single cell; they are structural/contractile proteins surrounded by a membrane

Question 11

how many microns wide are muscle fibres?

Answer 11

50-100

Question 12

What are the different phenotypes possible for muscle fibres?

Answer 12

fast vs slow; fatigable vs unfatigable

Question 13

Muscle fibres are grouped into functional ___ or ___

Answer 13

units or families (motor unit)

Question 14

T or F: recruitment and activation of muscle fibres vary

Answer 14

True

Question 15

What is the sarcolemma?

Answer 15

The sarcolemma is a phospholipid membrane that encapsulates each muscle fiber and is a barrier between cytosol and extracellular space

Question 16

What does the sarcolemma do?

Answer 16

regulates substrate entry, controls ion traffic, contains receptors (hormones)

Question 17

The sarcolemma generates and propogates ____ ____

Answer 17

Action potential

Question 18

The sarcolemma contain ______ openings that are known as action potential highways?

Answer 18

T-tuble