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Home Q & A Board Biology-Related Homework Help Anatomy and Physiology
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raeni6470 raeni6470
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12 years ago
Hi, I've been working on this homework for 3 days now and it is finally due tomorrow. I have only a few questions left that I was looking online to find and I stumbled upon this forum. 
I had question with

Number 9: Explain how wave summation and recruitment are achieved in vivo.
Number 13: Explain what happens to the active force with an increase in muscle length
Number 14: Explain what happens to the active force with a decrease in muscle length. 
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#1
Staff Member
12 years ago
Quote
Explain how wave summation and recruitment are achieved in vivo.

Summation is achieved by the nervous system increases firing rate of motor neurons. Recruitment is caused by neural activation of increasingly large numbers of motor units serving the muscle.

Quote
Explain what happens to the active force with an increase in muscle length

Active force increases until the optimal length is obtained, then decreases as muscle length continues to increase beyond optimal length.

Quote
Explain what happens to the active force with a decrease in muscle length.
 

Active force decreases as muscle length decreases.
- Master of Science in Biology
- Bachelor of Science
wrote...
#2
Educator
12 years ago
Quote from: jjdoil03 (12 years ago)
Descibe the chemical changes that are thought to correlate to this change in vivo.

Increasing availability of Ca++ in the sarcoplasm (more Ca++ expose more active binding sites on the thin filaments for cross-bridge attachment).
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