Biology Quiz

Which of these is not part of the structure of arteries?

• fibrin

• connective tissue

• smooth muscle

• endothelial tissue

A group of cells called the ____ causes the heart to contract.

• vena cava

• atrium

• pacemaker

• platelet

This figure shows the two circulatory loops in which blood flows. What occurs when blood from the lungs enters the left atrium?

• blood flows directly into veins

• first circulatory loop begins

• blood is deoxygenated

• second circulatory loop begins

How do platelets form blood clots?

• by producing white blood cells

• by producing fibrin

• by by releasing carbon dioxide

• by destroying red blood cells

What causes oxygen to diffuse from the lungs into the capillaries?

• equal oxygen concentration in lungs and capillaries

• oxygen concentration is lower in lungs

• oxygen concentration is lower in capillaries

• blood from pulmonary arteries is high in oxygen

Which of these is not a function of the circulatory system?

• removing wastes

• transporting blood

• conducting neuron impulses

• delivering oxygen

What are the three major types of blood vessels?

• arteries, valves, arterioles

• arteries, veins, capillaries

• veins, arterioles, capillaries

• capillaries, arterioles, valves

Which part of the vessels shown here prevents blood from flowing backwards?

• smooth muscle

• endothelium

• connective tissue

• valve

The heart pumps ____ blood to the lungs.

• deoxygenated

• oxygenated

• oxygen-rich

• depressurized

Why is the endothelial layer of arteries thicker than that of other blood vessels?

• Arteries must be rigid and inflexible.

• Arteries carry blood back to the heart.

• Artery blood exerts less pressure than blood in veins.

• Blood pumped from the heart exerts a high pressure