Circulatory System Functions and Structures

The video explains the circulatory system's role in transporting oxygen and nutrients while removing waste. Hemoglobin in red blood cells acts as a transporter. The system consists of two circuits: the pulmonary circuit, which oxygenates blood in the lungs, and the systemic circuit, which distributes oxygenated blood throughout the body. Blood flows through arteries, arterioles, and capillaries, where gas exchange occurs. Deoxygenated blood returns to the heart via veins, which have valves to prevent backflow. The video concludes with a call to action for viewers to engage with the content.

What is the primary function of the circulatory system?

• To transport oxygen and nutrients

• To produce hormones

• To store energy

• To digest food

What protein in red blood cells is responsible for transporting oxygen?

• Keratin

• Hemoglobin

• Collagen

• Myoglobin

Which circuit in the circulatory system is responsible for oxygenating blood?

• Coronary circuit

• Pulmonary circuit

• Systemic circuit

• Lymphatic circuit

What is the role of the systemic circuit?

• To transport oxygenated blood to the body

• To oxygenate blood in the lungs

• To filter waste from the blood

• To regulate body temperature

What is the main artery that carries blood away from the heart?

• Carotid artery

• Vena cava

• Pulmonary artery

• Aorta

Why do arteries have thick muscular walls?

• To prevent blood clots

• To absorb nutrients

• To withstand high pressure

• To store blood

What happens to blood flow in the capillaries?

• It stops completely

• It speeds up

• It remains constant

• It slows down

What is the function of valves in veins?

• To store oxygen

• To increase blood pressure

• To prevent backward flow

• To filter blood

Before reaching the lungs, where does deoxygenated blood travel?

• Directly to the lungs

• To the liver

• To the kidneys

• To the heart

What is the final destination of deoxygenated blood before it gets re-oxygenated?

• The intestines

• The stomach

• The lungs

• The brain