GCSE Biology - The Heart #23

The video explains the circulatory system, focusing on the heart's structure and function. It describes the double circulatory system, detailing how blood flows through the heart, lungs, and body. The heart's chambers, valves, and pacemaker cells are discussed, along with the distinction between arteries and veins. The video also highlights the coronary arteries' role in supplying the heart with oxygenated blood.

What is the primary function of the circulatory system?

• To digest food

• To transport oxygen and nutrients

• To store energy

• To produce hormones

How many chambers does the human heart have?

• Four

• Five

• Three

• Two

What prevents blood from flowing backward in the heart?

• Bones

• Valves

• Muscles

• Nerves

What is the role of pacemaker cells in the heart?

• To digest food

• To produce hormones

• To regulate heartbeat

• To store energy

Which vessel carries oxygenated blood to the heart?

• Pulmonary artery

• Pulmonary vein

• Aorta

• Vena cava