Lecture 26: Skeletal Muscle Energy, Types, and Function Flashcards Preview

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Flashcards in Lecture 26: Skeletal Muscle Energy, Types, and Function Deck (22):
1

Energy sources for contraction include:

- ATP
- CP
- Anaerobic Metabolism
- Aerobic Metabolism

2

What is a limitation of using ATP for muscle contraction?

- There are limited stores of ATP in muscle

3

The breakdown of Creatine + Phosphate can resynthesise the...

- ATP

4

What're some features of anaerobic respiration?

- Short term
- Fast energy production
- No O2 required
- ATP, CP, glycolysis

5

What're some features of aerobic respiration?

- Long term, steady
- Slower energy production
- O2 required
- Oxidative phosphorylation

6

Out of Excitation, Contraction, and Relaxation, which stage requires energy?

- Relaxation
- Need ATP to uncouple the cross-bridge
- Need ATP to re-uptake Calcium into the SR

7

No ATP?...

- RIGOR MORTIS

8

Oxygen binds to ______ in the blood, and ______ in muscle. Both pigments colour red due to oxygen _____ binding.

- Haemoglobin
- Myoglobin (only one iron group)
- Iron

9

The soleus muscle tenses slowly and help with...

- Posture

10

Different type of muscle fibre types:

- Slow (Myosin Type I) Red
- Intermediate (Myosin Type IIA) Intermediate
- Fast (Myosin Type IIX) White

11

Feature of Slow Muscles (Myosin Type I)

- Slow rate interaction w/ actin
- Slow force production
- Slow energy consumption

12

Depending on their function muscles are dominated by one fibre type or....

- A mix of fibre types

13

World class sprinters need explosive power, short duration, anaerobic metabolism, need relative less oxygen. This means that their leg muscles develop more....

- White (Fast) muscle

14

World class endurance athlete needs fatigue resistance, slower pace, uses aerobic metabolism

- Much higher proportion of slow/red and intermediate muscle fibre types (+ adaptations for supply of O2)

15

A single electrical stimulation of a muscle -> a single activation of may motor units =

- A twitch in the muscle

16

A twitch is a ______ event. To build up and _____ tension in a muscle takes longer than underlying _____ processes.

- Mechanical
- Decline
- Biochemical

17

In a series of spaced twitches a ______ effect occurs. This is due to sustained higher levels of sarcoplasmic ____. Actin-myosin interactions become more _____ to ____. At higher temperature, _____ tension can be produced.

- "Treppe" (Staircase)
- Ca2+
- Sensitive
- Ca2+
- More

18

In a series of closely spaced twitches, there can be incomplete tetanus or _____ tetanus. It's called tetanus after the bacterial infection. "Summation" = ____. Main mechanism of summation is due to _____ _____ of ___ in sarcoplasm.

- Complete
- More tension
- High levels
- Ca2+

19

Hypertrophy is the...

- Increase in number of contractile filaments
- More power
- Strength Training

20

Atrophy is the....

- Loss of number of contractile filaments
- Disuse

21

In Endurance training there needs to be an increased blood supply to muscle, therefore there's a higher number of....Also increased ______ metabolism.

- Blood Vessels
- Mitochondria
- Aerobic enzymes
- Aerobic

22

What occurs during Exhaustion?

- Physiological fatigue
- Depletion of ATP, Glucose, Glycogen, O2
- Build up of metabolic by-products e.g. lactic acid
- Psychological fatigue
- Fatigue from working muscles to brain produces sensation of fatigue, even though muscle is still capable of contracting