laBbccDc AaBbCc AaB 1Normal 11No Spac Heading 1 Head t, Paragraph True or False
ID: 3523702 • Letter: L
Question
laBbccDc AaBbCc AaB 1Normal 11No Spac Heading 1 Head t, Paragraph True or False Consider an entire muscle (such ar the biceps brachii). It has been stimulated by one motor unit to contract. A muscle twitch occurs. During the relaxation period, this muscle could be stimulated to contract again ip.order ta generate a stronger muscle contraction. In general, slow oxidative muscle fibers produce most of their ATP from glycolysis and subsequent anaerobic respiration Hemoglobin is a major storage site of oxygen in skeletal muscle tissue Possessing actin and myosin within a muscle will make the muscle appear striated. Therefore, only skeletal and cardiac muscle have actin and myosin. Smooth muscle does mot have actin nor myosin and is therefore unstriated In general, fast glycolytic muscle ibers (white fibers) are best suited for "short term use" as in sprinting. This is due to their heavy reliance on glycolysis. In muscles, a byproduct of aerobic respiration is lactic acidExplanation / Answer
1. True .
When a stimulus is applied during the relaxation period of previous contraction, the next contraction builds up on the previous contraction ( wave summation) to give a stronger contraction.
2.False
Slow oxidative fibres contract more slowly and the have large number of mitochondria. So they get ATP from aerobic respiration
3. False.
Haemoglobin is the transporter of oxygen in bloodstream.
4. False.
All muscles contain actin and myosin.
5. True
Fast glycolytic fibres derive ATP from anaerobic glycolysis. Also they contain less number of mitochondria. Thus they get easily fatigued. Thus they are used for short term use.
6. False
Lactic acid is the byproduct of anaerobic respiration.
7. False.
Atrophy is decrease in muscle mass.
8. False
Epimysium surrouds a bundle of many fascicles. Perimysium surrounds a fascicle.
9. False.
Red muscle fibres depend on aerobic respiration . So they can act for a longer period without accumulating lactic acid.
10. True
11.False
Sarcoplasmic reticulum stores most of the calcium in skeletal muscles.
12. False.
During refractory period, the muscle cells will not be responding to any stimulus.
13.False
Creatine phosphate converts ADP to ATP.
14.False.
Smooth muscles doesn't have calcium dependent troponin system. Here contraction is initiated by calcium regulated phosphorylation of myosin.
15.False.
When there is no oxygen , anaerobic respiration comes into action.
16.False
After death , breathing stops. So no oxygen and thus no ATP is produced.( ATP is required for breaking the actin - myosin cross bridges during relaxation. ) Thus body enters rigor mortis as breaking of the actin- myosin cross bridge does not break.
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