Practice-Circulatory-Respiratory Systems

A heart attack can occur if an artery in the _________ is clogged.

• brain
• heart
• liver
• lungs

_______, is the liquid part of the blood, is mostly made of water.

• Hemoglobin
• Lymph
• Plasma
• Platelets

_______ helps clot blood.

• lymph nodes
• platelets
• red blood cells
• white blood cells

The ______ fight bacteria and viruses.

• hemoglobin
• platelets
• red blood cells
• white blood cells

Blood vessels that carry blood away from the heart are called _____?

• arteries
• veins
• blood pressure
• atherosclerosis

Blood vessels that carry blood back to the heart are called?

• arteries
• veins
• blood pressure
• atherosclerosis

arteries, veins, and capillaries are three types of __________

• heart valves
• blood vessels
• cells
• veins

a structure that acts as a one-way gate

• left ventricle
• right ventricle
• heart valve
• lungs

the system of blood vessels and the heart

• circulatory system
• heart valve
• right atrium
• vein

__________ Very small tubes that connect arteries to veins; the smallest blood vessels.

• Veins
• Capillaries 
• Arteries