This topic contains a solution. Click here to go to the answer
« previous next »

Author Question: In most patients, the sinoatrial (SA) and atrioventricular (AV) nodes are supplied by the _____ ... (Read 48 times)

pane00

  • Hero Member
  • *****
  • Posts: 579
on: Jun 25, 2018
In most patients, the sinoatrial (SA) and atrioventricular (AV) nodes are supplied by the _____ coronary artery.
 
  a. right
  b. left main
  c. circumflex
  d. left anterior descending

Question 2

Stimulation of beta2 receptor sites results in _____.
 
  a. increased heart rate
  b. peripheral vasoconstriction
  c. constriction of renal blood vessels
  d. relaxation of bronchial smooth muscle


Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
Marked as best answer by a Subject Expert

Sammyo

  • Sr. Member
  • ****
  • Posts: 329
Reply #1 on: Jun 25, 2018
Answer to Question 1

A
The SA node receives its blood supply from the SA node artery that runs lengthwise through the center of the node. The SA node artery originates from the right coronary artery in about 60 of people. The AV node is supplied by the right coronary artery in 85 to 90 of the population. In the remainder, the circumflex artery provides the blood supply.

Answer to Question 2

D
Beta2 receptor sites are found in the arterioles of the heart, lungs, and skeletal muscle. Stimulation results in dilation. Stimulation of beta2 receptor sites in the smooth muscle of the bronchi results in dilation.


pane00

  • Hero Member
  • *****
  • Posts: 579
Reply #2 on: Jun 25, 2018
Thank you :)


Sammyo

  • Sr. Member
  • ****
  • Posts: 329
Reply #3 on: Jun 25, 2018
Happy to help you


« previous next »
 

Did you know?

The immune system needs 9.5 hours of sleep in total darkness to recharge completely.

Did you know?

People with high total cholesterol have about two times the risk for heart disease as people with ideal levels.

Did you know?

Many people have small pouches in their colons that bulge outward through weak spots. Each pouch is called a diverticulum. About 10% of Americans older than age 40 years have diverticulosis, which, when the pouches become infected or inflamed, is called diverticulitis. The main cause of diverticular disease is a low-fiber diet.

Did you know?

There are immediate benefits of chiropractic adjustments that are visible via magnetic resonance imaging (MRI). It shows that spinal manipulation therapy is effective in decreasing pain and increasing the gaps between the vertebrae, reducing pressure that leads to pain.

Did you know?

Bisphosphonates were first developed in the nineteenth century. They were first investigated for use in disorders of bone metabolism in the 1960s. They are now used clinically for the treatment of osteoporosis, Paget's disease, bone metastasis, multiple myeloma, and other conditions that feature bone fragility.

Palpation of Lymph Nodes, Supraclavicular Palpation of Lymph Nodes, Supraclavicular
Inguinal Lymph Nodes Inguinal Lymph Nodes
Photo of the neck of a patient with non-Hodgkin’s lymphoma showing the swelling associated with enla Photo of the neck of a patient with non-Hodgkin’s lymphoma showing the swelling associated with enla
Ribbon representation of the myosin S1 fragment (from coordinates supplied by Ivan Rayment Ribbon representation of the myosin S1 fragment (from coordinates supplied by Ivan Rayment
Suggested Antibiotic Prophylaxis Regimens in Patients at Potential Increased Risk of Hematogenous ... Suggested Antibiotic Prophylaxis Regimens in Patients at Potential Increased Risk of Hematogenous ...
Split-brain patients were shown composite photographs Split-brain patients were shown composite photographs
Video: Net filtration pressure and lymph formation, edema & blood velocity

For a complete list of videos, visit our video library