HS1 Circulatory System

Explain how the blood circulates through the heart to the body.

• The blood enters the right atrium, moves to the right ventricle, goes to the lungs, returns to the left atrium, moves to the left ventricle, and is pumped to the body.

• The blood enters the left atrium, moves to the left ventricle, goes to the lungs, returns to the right atrium, moves to the right ventricle, and is pumped to the body.

• The blood circulates only in the lungs before reaching the body.

• The blood moves directly from the right atrium to the body without passing through the lungs.

The electrical pathway of the heart is:

• SA node → AV node → Bundle of His → Purkinje fibers

• AV node → SA node → Purkinje fibers → Bundle of His

• Purkinje fibers → Bundle of His → AV node → SA node

• Bundle of His → SA node → AV node → Purkinje fibers

Capillaries are so small that RBCs travel through them single-file.

• True

• False

Which of the following is NOT one of the three main components of the circulatory system?

• Blood

• Blood Vessels

• Lungs

• Heart

Which of the following is NOT a type of blood vessel?

• Arteries

• Veins

• Capillaries

• Platelets

Blood vessels include arteries, veins, and ________.

• capillaries

• cartilage

• alveoli

• neurons

What is one of the main functions of blood?

• It nourishes the cells by bringing oxygen to them

• It produces hormones

• It digests food

• It stores fat

Blood carries away which of the following waste products?

• Oxygen and nutrients

• Carbon dioxide and dead cells

• Vitamins and minerals

• Water and salt

"Blood brings "food" AKA _______ to the cells."

• oxygen

• carbon dioxide

• glucose

• water

What are RBCs also known as?

• erythrocytes

• leukocytes

• thrombocytes

• plasma