1. Consider a sarcomere that is undergoing contraction. What is going on within

Question

1. Consider a sarcomere that is undergoing contraction. What is going on within the sarcomere?

a. actin and myosin filaments physically shorten

b. actin and myosin filaments interdigitate

2. What enables a muscle to stretch?

diminution of neurosecretion or   application of external force

3. A reflex is an involuntary, neuron-mediated response to a stimulus. Consider an animal standing still. Are there on-going reflexes within such an animal?

yes

no

4. Consider any given -motor neuron in the spinal cord. Is the information output of this neuron affected by sensory input from Golgi tendon organs and muscle spindles?

yes

no

5. Consider the global population of sensory neurons that innervate somatic muscle spindles. Now consider a single motor neuron within this population. Where would you find most of this neuron by volume?

dorsal root ganglion

spinal nerve

Explanation / Answer

1.
a. actin and myosin filaments physically shorten
physical and Chemical interactions between the myosin and actin causes length of sarcomere to shorten, & therefore the myocyte to contract during excitation-contraction coupling.

2.
application of external force

3.
yes
Even once animal standing still, the stretch reflexes within the skeletal muscles build many small changes to stay the body erect.

4.
yes

5.
dorsal root ganglion
it is a bunch of nerve cell bodies

Related Questions

Navigate

• Browse (All)
• Browse 1
• Subjects

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.