You are getting ready to leave the lab. You lift your pencil to put it in your b

Question

You are getting ready to leave the lab. You lift your pencil to put it in your book bag. Then, you lift your lab book and place it in your book bag. Which scenario resulted from the stimulation of more motor units? _ Why? _ Which would require more neural signals being sent by the nervous system to the muscles of your arms? _ Why? _ What concept covered in this lab (threshold, recruitment, or maximum contraction) explains why there are certain objects that are too heavy for you to lift? _ Explain your reasoning.

Explanation / Answer

13. - Between the scenario of lifting pencil into your bag and lifting lab book into the bag, the later results in stimulation of more motor units. Bacause lifting the lab book requires greater contractile strength in the muscle, and it happens with stimulation of more motor units.

- More neural signlas are being sent during the lifting of lab book. This is because of the involvment of more motor units that are inturn regulated by more neural signals.

- Certain objects are too heavy to lift. This due to the muscle contraction that reached its threshold limit. All the motor units are stimulated and further stimulation exerts no pressure failing us to lift the heavy objects.

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