1. A. True/False : If I have a large number of Type I muscle fibers, I should excel...

1. A. True/False : If I have a large number of Type I muscle fibers, I should excel in explosive events such as sprinting and high jumping.

B. True/False : During a muscle contraction, the cross-bridge between actin and myosin is released by ATP.

C. Fill in the blank : When a muscle is relaxed, calcium levels are high in the ____________. (sarcoplasm or sarcoplasmic reticulum)

D. Fill in the blank : The ___________ energy pathway makes large amounts of ATP, and does not result in the build-up of lactic acid.

Solutions

Expert Solution

A) False

Type 1 muscle Fibres are slow twitch muscle Fibres which supports long distance activities such as marathon unlike fast twitch muscles that supports fast nd powerful movement like sprinting and high jump

B) True

Myosin releases actin when ATP binds, resulting in detachment of actin and myosin from each other. And the bound ATP gets converted into ADP + Pi

C) sarcoplasmic reticulum

The calcium pump Powered by ATP pumps calcium ions back into the sarcoplasmic reticulum, reducing the calcium level around the actin and myosin filaments and allowing the muscle to relax so the calcium ion will be high in sarcoplasmic reticulum during relaxation.

D) aerobic

In aerobic respiration 36 net ATP are produced with carbon dioxide and water as byproducts unlike lactic acid fermentation which is an anaerobic process and result in production of only 2 net ATP and lactic acid as byproduct, that accumulates in muscle.

gladiator answered 1 year ago

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