Question

1. A substance interferes with the opening of the Na+ channels in the postsynaptic membrane, causing them to open more slowly when bound to a neurotransmitter. Explain, in detail, the effect this substance will have on the formation of an action potential in the postsynaptic neuron.

2. Explain which branches of the peripheral nervous system are acting when you are watching television at home. Describe the effects that each of these branches have on the body during this time

Answer 1

Ans 2

The sensory division of the PNS carries all types of sensory information to the CNS, including that from the "special senses" of touch, smell, taste, hearing, and sight, as well pain, body position (proprioception), and a variety of visceral sensory information. The information from the viscera (internal organs) includes some of which the body is aware (bladder fullness and stomach aches, for example), as well as much of which the body is not aware, including blood pressure, concentration of substances in the blood, and many other bits of sensory information used to regulate the internal environment.