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 36 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
Wow, this really help


triiciiaa

  • Member
  • Posts: 349
Reply 3 on: Yesterday
Great answer, keep it coming :)

 

Did you know?

Barbituric acid, the base material of barbiturates, was first synthesized in 1863 by Adolph von Bayer. His company later went on to synthesize aspirin for the first time, and Bayer aspirin is still a popular brand today.

Did you know?

On average, someone in the United States has a stroke about every 40 seconds. This is about 795,000 people per year.

Did you know?

One way to reduce acid reflux is to lose two or three pounds. Most people lose weight in the belly area first when they increase exercise, meaning that heartburn can be reduced quickly by this method.

Did you know?

In 2012, nearly 24 milliion Americans, aged 12 and older, had abused an illicit drug, according to the National Institute on Drug Abuse (NIDA).

Did you know?

According to the FDA, adverse drug events harmed or killed approximately 1,200,000 people in the United States in the year 2015.

For a complete list of videos, visit our video library