This topic contains a solution. Click here to go to the answer

Author Question: Which statement best describes the action of norepinephrine? 1. An enzymatic substance released ... (Read 34 times)

Deast7027

  • Hero Member
  • *****
  • Posts: 538
Which statement best describes the action of norepinephrine?
 
  1. An enzymatic substance released at receptors at the end of postganglionic nerves
  2. The neurotransmitter that binds to adrenergic receptors to produce a physiologic response
  3. The activation of beta receptors to constrict coronary blood vessels
  4. The stimulation of alpha receptors to decrease blood pressure

Question 2

The main action of acetylcholine (ACh) at cholinergic synapses in the peripheral nervous system results in which act?
 
  1. Inhibition of optic muscles
  2. Stimulation of cardiac muscle
  3. Contraction of skeletal muscle
  4. Relaxation of smooth muscle



Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
Marked as best answer by a Subject Expert

cascooper22

  • Sr. Member
  • ****
  • Posts: 312
Answer to Question 1

Correct Answer: 2
Rationale 1: Norepinephrine is not an enzyme.
Rationale 2: This best describes the action of norepinephrine. Norepinephrine binds to adrenergic receptors to produce a physiologic response.
Rationale 3: Activation of beta receptors causes dilation of coronary blood vessels.
Rationale 4: Norepinephrine acts on alpha and beta receptors, and its stimulation causes an increase in blood pressure by binding with alpha-2 receptors.
Global Rationale: The neurotransmitter that binds to adrenergic receptors to produce a physiologic response is the best statement that describes the action of norepinephrine. Norepinephrine is not an enzyme. Activation of beta receptors causes dilation of coronary blood vessels. Norepinephrine acts on alpha and beta receptors, and its stimulation causes an increase in blood pressure by binding with alpha-2 receptors.

Answer to Question 2

Correct Answer: 3
Rationale 1: Inhibition of optic muscles is a central nervous system response.
Rationale 2: Acetylcholine produces the opposite effect.
Rationale 3: The main action of ACh is contraction of skeletal muscles.
Rationale 4: Acetylcholine produces the opposite effect.
Global Rationale: The main action of ACh is contraction of skeletal muscles. Inhibition of optic muscles is a central nervous system response. Acetylcholine inhibits cardiac muscles and causes contraction of smooth muscles.




Deast7027

  • Member
  • Posts: 538
Reply 2 on: Jul 23, 2018
Great answer, keep it coming :)


ryansturges

  • Member
  • Posts: 338
Reply 3 on: Yesterday
Thanks for the timely response, appreciate it

 

Did you know?

As many as 20% of Americans have been infected by the fungus known as Histoplasmosis. While most people are asymptomatic or only have slight symptoms, infection can progress to a rapid and potentially fatal superinfection.

Did you know?

The U.S. Pharmacopeia Medication Errors Reporting Program states that approximately 50% of all medication errors involve insulin.

Did you know?

Elderly adults are living longer, and causes of death are shifting. At the same time, autopsy rates are at or near their lowest in history.

Did you know?

Human stomach acid is strong enough to dissolve small pieces of metal such as razor blades or staples.

Did you know?

People with alcoholism are at a much greater risk of malnutrition than are other people and usually exhibit low levels of most vitamins (especially folic acid). This is because alcohol often takes the place of 50% of their daily intake of calories, with little nutritional value contained in it.

For a complete list of videos, visit our video library