Can I get some help on this physiology HW? thanks! Listed below are a series of

Question

Can I get some help on this physiology HW? thanks!

Listed below are a series of problems within the body: you tell me if these issues could be caused by an overactive or underactive sympathetic nervous system. decreased circulating levels of epinephrine decreased stomach motility low blood pressure slow, deep breaths a) overactive sympathetic nervous system underactive sympathetic nervous system Many drugs are sympathomimetic, meaning that the effects of these drugs mimic the effects of sympathetic nervous system stimulation when taken. Select the statement below that BEST describes how a drug could produce these effects in an individual. a) sympathomimetic drugs inhibit release of acetylcholine from the axon terminal b) sympathomimetic drugs inhibit release of hormones from the adrenal medulla c) sympathomimetic drugs promote muscarinic receptor activity d) sympathomimetic drugs promote norepinephrine receptor activity Tell me which receptor you would find at which location. dendrites of a neuron innervated by cranial nerve X (CN 10/vagus nerve) dendrites of a postganglionic neuron in the sympathetic chain ganglia heart tissue innervated by a postganglionic neuron of a very nearby ganglia heart tissue innervated by a postganglionic neuron of the sympathetic chain ganglia a) muscarinic receptor b) nicotinic receptor c) noradrenergic receptor

Explanation / Answer

1)The sympathetic nervous system is involved in the body's fight-or-flight response, so responses like low blood pressure and slow and deep breaths (which are rest and digest conditions) are typical of underactive SNS. Decreased stomach motility, on the other hand, is involved with an overactive SNS. Epinephrine is the hormone which is released in large amounts during fight and flight response and hence decreased levels of the same shows underactive SNS. So, point 1, 3 and 4 show underactive SNS while point 2 shows overactive SNS.

2) The correct answer is Option D. Sympathomimetic drugs promote norepinephrine receptor activity. These class of drugs mimics the agonists of SNS like the epinephrine, norepinephrine, and dopamine.

3) Dendrites of a postganglionic neuron will contain nicotinic receptors. Dendrites of neuron innervated by vagus nerve will be a Muscarinic receptor as they are associated with parasympathetic nerves and the vagus nerve interfaces with parasympathetic control. Studies have shown that ganglionic cells have acetylcholine receptors so heart tissue innervated by nearby ganglia will have muscarinic receptors. Noradrenergic receptors can be seen on heart tissue innervated by postganglionic neuron of sympathetic chain neurons.

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