quiz 2

What are the cells called that help fight infections in the body?

• Red Blood Cells

• Platelets

• White Blood Cells

• Veins

Answer explanation

White blood cells are crucial for the immune system as they help fight infections by attacking pathogens. In contrast, red blood cells carry oxygen, platelets aid in clotting, and veins are blood vessels.

Which type of blood vessel carries blood away from the heart?

• Veins

• Arteries

• Capillaries

• Vessels

Answer explanation

Arteries are the blood vessels that carry blood away from the heart to the rest of the body. In contrast, veins carry blood back to the heart, and capillaries are small vessels where the exchange of substances occurs.

What is the main function of platelets in the blood?

• Carry oxygen

• Fight infections

• Help in clotting

• Transport nutrients

Answer explanation

The main function of platelets is to help in clotting. They aggregate at injury sites to form a plug, preventing excessive bleeding, which is crucial for wound healing and maintaining blood vessel integrity.

What is the term for the system that circulates blood throughout the body?

• Respiratory System

• Digestive System

• Circulatory System

• Nervous System

Answer explanation

The system that circulates blood throughout the body is called the Circulatory System. It is responsible for transporting oxygen, nutrients, and waste products, making it essential for maintaining overall health.

What is the name of the vessels that return blood to the heart?

• Arteries

• Veins

• Capillaries

• Vessels

Answer explanation

Veins are the blood vessels responsible for returning deoxygenated blood back to the heart, while arteries carry blood away from the heart. Capillaries are small vessels where gas exchange occurs, not for returning blood.

What is the term for the liquid part of blood that carries cells and nutrients?

• Plasma

• Platelets

• Red Blood Cells

• White Blood Cells

Answer explanation

The liquid part of blood that carries cells and nutrients is called plasma. It makes up about 55% of blood volume and is essential for transporting substances throughout the body.

What happens when blood vessels are damaged and blood leaks out?

• Clotting

• Bleeding

• Circulation

• Pumping

Answer explanation

When blood vessels are damaged, blood leaks out, leading to bleeding. This is the body's response to injury, where blood escapes from the circulatory system.

What is the term for the flow of blood through the circulatory system?

• Blood stream

• Blood flow

• Blood path

• Blood route

Answer explanation

The term for the flow of blood through the circulatory system is "blood stream." This term accurately describes the continuous movement of blood within the vessels, distinguishing it from other less common terms like "blood flow" or "blood route."

What are the small blood vessels where exchange of substances occurs?

• Arteries

• Veins

• Capillaries

• Vessels

Answer explanation

Capillaries are the small blood vessels where the exchange of substances, such as oxygen and nutrients, occurs between blood and tissues. Unlike arteries and veins, capillaries have thin walls that facilitate this exchange.

What is the function of red blood cells?

• Fight infections

• Carry oxygen

• Help in clotting

• Transport hormones

Answer explanation

The primary function of red blood cells is to carry oxygen from the lungs to the body's tissues and return carbon dioxide to the lungs for exhalation. This makes 'Carry oxygen' the correct answer.