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 35 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?

Many of the drugs used by neuroscientists are derived from toxic plants and venomous animals (such as snakes, spiders, snails, and puffer fish).

Did you know?

The U.S. Preventive Services Task Force recommends that all women age 65 years of age or older should be screened with bone densitometry.

Did you know?

Once thought to have neurofibromatosis, Joseph Merrick (also known as "the elephant man") is now, in retrospect, thought by clinical experts to have had Proteus syndrome. This endocrine disease causes continued and abnormal growth of the bones, muscles, skin, and so on and can become completely debilitating with severe deformities occurring anywhere on the body.

Did you know?

Children of people with alcoholism are more inclined to drink alcohol or use hard drugs. In fact, they are 400 times more likely to use hard drugs than those who do not have a family history of alcohol addiction.

Did you know?

According to research, pregnant women tend to eat more if carrying a baby boy. Male fetuses may secrete a chemical that stimulates their mothers to step up her energy intake.

Palpation of Lymph Nodes, Anterior Cervical Chain Palpation of Lymph Nodes, Anterior Cervical Chain
Palpation of Lymph Nodes, Posterior Cervical Chain Palpation of Lymph Nodes, Posterior Cervical Chain
Patients unable to stand may be weighed using a chair scale. Patients unable to stand may be weighed using a chair scale.
Instructing Patients According to Their Needs: Teaching Peak Flow Measurement Instructing Patients According to Their Needs: Teaching Peak Flow Measurement
Principal component analysis of blood plasma metabolites in chronic myeloid leukemia (CML) patients Principal component analysis of blood plasma metabolites in chronic myeloid leukemia (CML) patients
Identify the junction nodes in the circuit shown in Figure 21-1. Identify the junction nodes in the circuit shown in Figure 21-1.
Video: Barriers - eye structures, digestive mucosa, respiratory mucosa & genitourinary mucosa

For a complete list of videos, visit our video library