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 35 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
Excellent


steff9894

  • Member
  • Posts: 337
Reply 3 on: Yesterday
Wow, this really help

 

Did you know?

Many medications that are used to treat infertility are injected subcutaneously. This is easy to do using the anterior abdomen as the site of injection but avoiding the area directly around the belly button.

Did you know?

Approximately 25% of all reported medication errors result from some kind of name confusion.

Did you know?

Medication errors are three times higher among children and infants than with adults.

Did you know?

Although the Roman numeral for the number 4 has always been taught to have been "IV," according to historians, the ancient Romans probably used "IIII" most of the time. This is partially backed up by the fact that early grandfather clocks displayed IIII for the number 4 instead of IV. Early clockmakers apparently thought that the IIII balanced out the VIII (used for the number 8) on the clock face and that it just looked better.

Did you know?

Most fungi that pathogenically affect humans live in soil. If a person is not healthy, has an open wound, or is immunocompromised, a fungal infection can be very aggressive.

For a complete list of videos, visit our video library