2.3 Cardiac Cycle

Why are the walls of the left ventricle thicker than that of the right ventricle?

• The left ventricle must force blood into all the capillaries of the lungs 
• the left ventricle doesn't skip leg day
• This is false, the walls of the right ventricle are thicker
• Blood from the left ventricle is pumped throught the entire body 

Receives oxygenated blood from the lungs

• Right Ventricle
• Left Ventricle
• Right Atrium
• Left Atrium

A flap of tissue that prevents blood from flowing backward

• Aorta
• Atrium
• Septum
• Valve

Receives blood from the body that is low in oxygen and high in carbon dioxide

• Right Atrium
• Right Ventricle
• Left Atrium
• Left Ventricle

Tags

NGSS.MS-LS1-3

Pumps deoxygenated blood to the lungs

• Right Ventricle
• Right Atrium
• Left Ventricle
• Left Atrium

An electrocardiogram measures what?

• The amount of pressure exerted on blood vessels.
• The electrical activity of the heart.
• How many times the heart contracts over time.
• The body's temperature caused by friction of blood in vessel.

The entrance to the ascending aorta is guarded by

• an atrioventricular valve

• bicuspid valve

• semilunar valve

• tricuspid valve

The opening of semilunar valves is due to

• increased ventricular pressure

• decrease ventricular pressure

• increased aortic pressure

• increase in artrial volume

Which component of ECG cycle shows ventricular depolarisation?

• P

• QRS

• T

• U

In the diagram below, which part of the tracing represents the contraction of the atria?

• P

• T

• R

• S