Chapter 19 Part 3

Chemoreceptors react to all the following EXCEPT:

• Decreased O2

• Increased CO2

• Decreased Blood pressure

• Decreased pH

Tags

NGSS.HS-LS1-3

The amount of blood (mL) coming from one ventricle in one minute is called:

• the preload

• the afterload

• the stroke volume

• the cardiac output

When the left ventricle contracts the _____ valve closes and the _____ valve is pushed open.

• bicuspid; pulmonary

• tricuspid; aortic

• mitral; aortic

• tricuspid; pulmonary

The heart rate is increased by:

• hypothyroidism

• acetylcholine

• norepinephrine

• vegas nerve stimulation

Tags

NGSS.HS-LS1-3

Which of these does not DIRECTLY contribute to cardiac output (CO)? Hint: think of the CO equation

• EDV

• ESV

• Heart rate

• Blood pressure

The cardiac center, which modifies the heart rate, is located in:

• the SA node

• the AV node

• the aortic arch

• the medulla oblongata

Tags

NGSS.HS-LS1-3

A substance that reduces the strength of contractility is said to exert:

• a positive inotropic effect

• a negative chronotropic effect

• a positive barotropic effect

• a negative inotropic effect

Which one of the following parts of the conduction system directly stimulates the ventricles?

• SA node

• AV node

• Purkinje fibers

• bundle of His