Muscle Physiology

Question 1

What is the function of T tubules?

Answer 1

To conduct stimulatory impulses

Question 2

What is the role of the sarcoplasmic reticulum?

Answer 2

Sequestration of Ca2+

Question 3

What function does titin have?

Answer 3

Maintaining functional integrity of myofibrils

Question 4

How are each of the types of connective tissue found?

Answer 4

Endo: Between each MF
Peri: Binds MF to form fascicles
Epi: Binds fasciculi to form muscles

Question 5

What type of muscle fibres are slow twitch and how do they get energy?

Answer 5

Type 1

Oxidative processes as have lots of mitochondria

Question 6

Where would you find Type 1 muscle fibres?

Answer 6

Postural muscles

Question 7

What type of muscle fibres are sensitive to fatigue? And how gain energy?

Answer 7

Type 2b

Glycolytic energy processes

Question 8

How do type 2a muscle fibres gain energy?

Answer 8

Oxidative and glycolytic energy processes

Question 9

Which muscle fibre would appear darker when stained?

Answer 9

Type1: Lots of fibrillar ATPase for oxidative energy processes and lots of mitochondria

Question 10

What are the advs/disadvs of anaerobic metabolism?

Answer 10

Adv: Produce ATP in absence of O2
DisAdv: ATP yield low and toxic products are generated

Question 11

What is the role of Creatine?

Answer 11

1) Ingested from diet and transported to muscles
2) Provides a readily source of energy in first few minutes of intense exercise
(Improve strength, increase muscle mass and quicker muscle recovery)