3.2.3 The heart

• What are the four main chambers of the heart?

  Right atrium, right ventricle, left atrium, left ventricle
• The right atrium receives deoxygenated blood from the body
• The left atrium receives oxygenated blood from the lungs.


  True
• Match the valve with its location:

  Tricuspid valve ↔️ Right atrium to right ventricle

  Pulmonary valve ↔️ Right ventricle to pulmonary artery

  Mitral valve ↔️ Left atrium to left ventricle

  Aortic valve ↔️ Left ventricle to aorta
• During atrial systole, the atria contract and push blood through the tricuspid and mitral valves
• What happens during diastole?

  Heart relaxes, valves close
• The heartbeat is regulated by both intrinsic and extrinsic control
• The autonomic nervous system and hormones play a role in extrinsic control of the heartbeat.


  True
• The chambers of the heart are separated by valves
• The pulmonary valve is located between the right ventricle and the pulmonary artery.


  True
• Which valve ensures blood flow from the left ventricle to the aorta?

  Aortic valve
• The right atrium receives deoxygenated blood from the body.


  True
• What type of blood does the left atrium receive?

  Oxygenated blood
• During atrial systole, the atria contract, pushing blood into the ventricles
• The intrinsic control of the heartbeat is regulated by the SAN and AVN
• Match the control mechanism with its key components:

  Intrinsic Control ↔️ SAN and AVN nodes

  Extrinsic Control ↔️ Autonomic nervous system and hormones
• Veins carry deoxygenated blood from tissues back to the heart
• Arrange the sequence of blood flow through the heart.

  1️⃣ Deoxygenated blood enters right atrium via vena cava

  2️⃣ Blood flows to right ventricle

  3️⃣ Right ventricle pumps blood to pulmonary artery

  4️⃣ Blood is oxygenated in lungs

  5️⃣ Oxygenated blood returns to left atrium via pulmonary veins

  6️⃣ Blood flows to left ventricle

  7️⃣ Left ventricle pumps blood to aorta
• Which chamber pumps deoxygenated blood to the lungs?

  Right ventricle
• The left ventricle pumps oxygenated blood to the body
• What is the cardiac cycle divided into?

  Atrial systole, ventricular systole, diastole
• Steps of ventricular systole

  1️⃣ Ventricles contract

  2️⃣ Tricuspid and mitral valves close

  3️⃣ Pulmonary and aortic valves open

  4️⃣ Blood flows into pulmonary artery and aorta
• Match the phase with its description:

  Atrial systole ↔️ Atria contract, blood flows to ventricles

  Ventricular systole ↔️ Ventricles contract, blood flows to arteries

  Diastole ↔️ Heart relaxes, blood fills atria
• Which two nodes are involved in intrinsic control of the heartbeat?

  SAN and AVN nodes
• What is the primary function of the heart?

  Pumps oxygenated blood
• Which valve is located between the right atrium and the right ventricle?

  Tricuspid valve
• The mitral valve is located between the left atrium and the left ventricle
• Arrange the sequence of phases in the cardiac cycle.

  1️⃣ Atrial Systole

  2️⃣ Ventricular Systole

  3️⃣ Diastole
• The right ventricle pumps deoxygenated blood to the lungs
• The left ventricle pumps oxygenated blood to the body.

  True
• Which valves are open during ventricular systole?

  Pulmonary and Aortic
• What two systems modulate heart rate in extrinsic control?

  Autonomic nervous and hormones
• Arteries carry oxygenated blood from the heart to tissues.


  True
• What type of blood vessels facilitate gas exchange between blood and tissues?

  Capillaries