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PBL L&B3
PBL limbs and back week 3 Muscles
| Question | Answer |
|---|---|
| What is the outer most layer of a muscle? A)Epicardium B) Epimysium C)Perimysium D)Endomysium | B) Epimysium! (Perimysium lines each muscle fasicle and Endomysium lines each muscle fibre) |
| From which germ layer does skeletal muscle form from? | Mesoderm |
| What is the plasma membrane equivilent of a muscle cell called? | Sarcolemma |
| What is the cytoplasm of a muscle cell called? | Sarcoplasm |
| Muscle Action potentials travel through the ____ and then down the _-______! | Muscle action potentials travel through the Sarcolemma and then down the T Tubule |
| What protein enables the diffusing of oxygen from blood into muscle fibres? | MYOGLOBIN |
| What is the I band and A band? | I band is area of filament with only thin (actin) filaments exposed, and A band is area of entire length of thick filaments? |
| What is H zone? | H zone is area with just thick (myosin) filaments exposed |
| What is a titin filament? | Molecular spring like protein that connects the M line to the Z line |
| In muscle excitation, Ach binding to its active sites on the sarcolemma cause a opening of ____ channels that instigate an action potential down the sarcolemma and down the T-Tubles. | SODIUM Channels |
| What are the three main mechanisms by which muscle cells produce ATP? | Creatine phosphate pathway, Anaerobic Pathway and Aerobic Pathway |
| The reaction catalysed by creatine kinase to produce ATP is... | ... Creatine phosphate + ADP --> ATP + creatine |
| In anaerobic generation of ATP, a glucose molecule is broken down into two molecules of what? | PYRUVIC acid |
| During times of high excercise Pyruvic acid is converted to _____ acid | Lactic Acid |
| What happens to pyruvic acid during AEROBIC respiation? | Pyruvic acid is oxidised into CO2, ATP and H20 |
| In aerobic respiration One molecule of glucose produces around __ molecules of ATP | Aerobic respiration results in one molecule of glucose producing around 36 molecules of ATP |
| In anaerobic respiration, one molecule of glucose produces around __ molecules of ATP | One molecule of glucose produces 2 molecules of ATP in anaerobic resp |
| What are the three different types of muscle fibres? | Slow-Oxidative Fibres, Fast Oxidative Glycolytic Fibres, Fast Glycolytic fibres |
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SS1VA
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