Which of the following situations is most likely to involve the action of the parasympathetic nervous system?

The situation that involves the action of the parasympathetic nervous system is : ( A ) After a satisfying evening meal, Callum relaxes in front of the television

The parasympathetic nervous system regulates the rest and digest conditions in the body while the sympathetic nervous system regulates the fight or flight conditions in the body.

This is because the main function of PNS is to conserve the energy available in the human body and also regulate bodily activities like digestion and urination.

Therefore from the options attached below the situation that is most likely to involve the action of PNS is  After a satisfying evening meal, Callum relaxes in front of the television

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Out of the following given choices

a) Brooke’s finger accidentally grazes the hot iron; she immediately yanks her hand away.

primary succession occurs in essentially lifeless areas regions in which the soil is incapable of sustaining life as a result of such factors as lava flows, newly formed sand dunes, or rocks left from a retreating glacier. secondary succession occurs

the answer is: the „power stroke“ step.

muscle contraction can be divided into a few steps:

1. the release of ach (acetylcholine) in the synaptic cleft, binding of ach for its receptor and consequently opening of the ca channels.

2. the release of ca, binding of ca for the troponin

3. troponin shifting the tropomyosin, which was blocking the active site on the actin

4. myosin heads attaching to actin by breaking down atp to adp+ pi

5.   formation of the ‘cross-bridge’ on the active site of the actin filament by myosin head

6. “power stroke” -the cross bridge pulls actin, which slides over the myosin

9.     7. the release of adp completes the cross-bridge movement and atp attaches to myosin, breaking the actin-myosin cross bridge.