12A Quiz

The circulatory system consists of the ​ (a)   , ​ (b)   , and ​ (c)   .

• heart
• blood vessels
• blood
• lungs
• ventricles
• aorta

The ____ side of the heart pumps blood to the rest of the body.

Blood is pumped to the lungs by the ____ side of the heart.

The heart is a hollow organ that has walls made of strong ___.

• blood

• blood vessels

• muscle

• valves

Match the following

• group of cells that sends electric currents to the heart

• pacemaker

• top chamber on either side of the heart

• atrium

• small flap of tissue that prevents blood flowing backward

• valve

• lower chamber on either side of the heart

• ventricle

The heart is constantly pumping and the blood flows ​ (a)   .

• in only one direction
• in only two directions
• through any blood vessel
• north to Alaska

The number of times your heart beats in a minute is called your ____

• pulse

• heart rate

• rythm

• beat

The push of blood through the blood vessels each time your heart beats is called your ____

• ventricle

• pacemaker

• pulse

• valve

Doctors use a device called a(n) __________ to hear your heart beating

• stethoscope

• oscilloscope

• pacemaker

• speedometer

Electrical signals made by your pacemaker can be read by a special machine called a(n) _________

• Stethoscope

• Ultrasound

• X-ray

• electrocardiograph, or EKG