Advancement in technology. For example, body odor on humans was considered attractive thousands of years ago. Now it's just considered a hassle and we try our best to get rid of the smell.
It reduces the amount of harmful rays released by the sun and It increases the levels of carbon dioxide in the air.
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Answer:
Type IIA- Fast twitch, fatigue resistant unit
Explanation:
During intense activities such as exercises where there is an increase in the contractile muscle strength, there is an activation of additional muscles to accomplish the task.
This is referred as motor unit recruitment.
It can be type I where it involves slow twitch fatigue resistant units with small twitch tension and slowest contraction
Or Type II A- where fast twitch, fatigue resistant fibers are activated to enable a larger force and faster contraction.
