Circulatory system

What is the main function of the circulatory system?

• secrete enzymes

• digest proteins

• produce hormones

• transport materials

carry blood towards the heart.

• Veins

• Arteries

• Capillaries

• Small Intestines

carry blood away from the heart.

• Capillaries

• Veins

• Arteries

• Lungs

connects arteries to veins, site of exchange for nutrients, waste and oxygen.

• Capillaries

• Veins

• Arteries

• Valves

liquid portion of blood, typically yellow, where nutrients are dissolved.

• Blood

• Plasma

• Lymph

• Mucus

The smallest blood cells needed for clotting are called ____________

Which component of blood is responsible for carrying oxygen to the body's tissues?

• Red blood cells
• Platelets
• Plasma
• White blood cells

Which type of blood cell is responsible for fighting infections and foreign invaders in the body?

• White blood cells
• Red blood cells
• Plasma
• Platelets

What is the main organ of the circulatory system?

• small intestine

• bone

• lungs

• heart

How does the heart work?

• It pumps blood first to the lungs, back to the heart and then around the rest of the body.

• It pumps blood first to the rest of the body, back to the lungs and then to the heart.

• It pumps blood around the rest of the body, back to the heart and then to the lungs,