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Flashcards in Exam 1 Deck (34)
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1

The muscle fiber is composed of many ________grouped together

Myo fibrils

2

The process of converting substrates into energy is called

Bioenergetics

3

What are the two main contractile proteins in a muscle contraction?

Actin
Myosin

4

What is the main cause in hitting the wall in an endurance competition?

Hypoglycemia

5

Hypoglycemia

Not having enough glycogen

6

What is cardiac output ?

Stroke volume x heart rate

7

Humans can store approx ______ kcal in the body

2500

8

How do we determine respiratory exchange ratio?

VCO2/VO2

9

Name 3 adaptations to aerobic training?

Increase VO2max
Mitochondrial increase
Increase myoglobin
Increase oxidative enzymes
Angiogenesis

10

What structure is used for oxygen storage in the muscle?

Myoglobin

11

Name the 4 main properties of muscle

Excitability
Elasticity
Extensibility
Contractibility

12

With training the body can oxidize ______ and use it for energy

Lactate

13

What part of the body likes to use lactate

Brain and heart

14

At rest we use _______ as fuel At high intensity primarily ______ is used at low intensity

50% fat 50%carb
Carb

15

What structure allows action potentials to propagate?

T tubules

16

What produces more ATP? Glycogen or glucose ? How much ATP is produced by each ?

Glycogen
2/3 ATP

17

What is the primary energy system
Of the brain?

Carbs

18

What term refers to increased capillary density if muscle?

Angiogenesis

19

What is running economy?

The O2 uptake needed to run at a given velocity

20

What are 3 main function of muscle?

Movement
Skeletal stability
Protect internal organs
Generate heat

21

What are the 2 thinks that effect the activity of enzymes ?

Temp and ph

22

What do enzymes do ?

Breakdown ATP -->adp +p

Speed up reactions

23

A way to artificially enhance red blood cell concentration

Blood doping

24

When actin and myosin overlap they form

Cross bridges

25

For the 2 athletes with the same VO2max the person with _______ has better performance?

Lactate threshold

26

What neurotransmitter allows action potential to enter cell

Acetylcholine

27

If the production is equal to the rate of clearing this substrate can be used as an energy source

Lactate

28

A myo fibril is composed of many what linked together?

Sarcomeres

29

Muscle spindles provide information regarding the _______ of muscles while the Golgi tendon organ provide information about ______ of muscles

Length
Tension

30

________ help lower the activation energy needed for a chemical reaction and also regulate the speed of reactions within a cell . Two primary contributors to the amount of their activity are ______ and ______

Enzymes
Ph
Temp

31

The sarcoplasmic reticulum is responsible for storing and releasing ______

Calcium

32

Hydrolysis is a reaction that results in

Breaking down ATP into adp and phosphate

33

During excitation contraction coupling _______ binds to the_______ via the _____ binding site

Myosin head
Actin filament
Troponin

34

What is the primary mineral needed in the body?

Calcium