Heart Anatomy
Name the chamber that receives blood from the vena cavae
Right Atrium
What structure receives blood immediately after the vena cavae?
Right Atrium
Valve between the right atrium and right ventricle
Tricuspid
Right atrium: oxygenated or deoxygenated?
Deoxygenated
Which ventricle pumps to the lungs?
Right Ventricle
Name the structure that separates the right and left sides of the heart.
Septum
What vessel carries blood from the right ventricle toward the lungs?
Pulmonary artery/pulmonary trunk
Valve between the left atrium and left ventricle.
Mitral/Bicuspid
Pulmonary veins: oxygenated or deoxygenated?
oxygenated
Which ventricle pumps to the body?
Left Ventricle
Which chamber has the thickest muscular wall, and why?
Left Ventricle; it must generate pressure for systemic circulation.
Trace blood from the right atrium to the lungs.
Right atrium → tricuspid → right ventricle → pulmonic → pulmonary arteries → lungs
Valve crossed immediately before the pulmonary artery/trunk
Pulmonic
Why is the pulmonary artery an exception to the common oxygenation rule for arteries?
Arteries are defined by carrying blood away from the heart; the pulmonary artery carries deoxygenated blood from the right ventricle to the lungs.
If the left ventricle cannot pump effectively, which circulation receives reduced forward flow?
Systemic Circulation
Name the four chambers in the order blood normally encounters them, beginning with the right atrium.
Right atrium → right ventricle → left atrium → left ventricle (with pulmonary circulation occurring between the right and left sides).
Trace blood from the lungs to the aorta
Lungs → pulmonary veins → left atrium → mitral → left ventricle → aortic valve → aorta
Valve crossed immediately before the aorta
Aortic
Why is the pulmonary vein an exception to the common oxygenation rule for veins?
Veins are defined by carrying blood toward the heart; pulmonary veins return oxygenated blood from the lungs to the left atrium.
If the tricuspid valve fails to close, in which direction can blood regurgitate?
Backward from the right ventricle toward the right atrium.
Describe the functional difference between the right and left sides of the heart.
The right side receives systemic venous blood and pumps to the lungs; the left side receives pulmonary venous blood and pumps to the body.
Trace one complete circuit from body tissues back to body tissues.
Start in body tissues (systemic capillaries)
Oxygen-rich blood arrives from the heart via arteries and arterioles.
In tissue capillaries, oxygen and nutrients diffuse into cells, while carbon dioxide and wastes diffuse into the blood
The blood is now deoxygenated.
2. Return to the heart via veins
Deoxygenated blood collects in venules, then into larger veins.
It flows into the superior vena cava (from upper body) or inferior vena cava (from lower body)
These veins empty into the right atrium of the heart.
3. Right ventricle → pulmonary artery
Blood passes through the tricuspid valve into the right ventricle.
The right ventricle contracts, sending blood through the pulmonary valve into the pulmonary artery
4. Pulmonary circuit (lungs)
Pulmonary arteries branch into lung capillaries surrounding alveoli.
Gas exchange: CO₂ diffuses out into alveoli to be exhaled; O₂ diffuses into red blood cells
Blood is now oxygenated.
5. Pulmonary veins → left atrium
Oxygenated blood returns via pulmonary veins into the left atrium
6. Left ventricle → aorta
Blood passes through the mitral valve into the left ventricle.
The left ventricle contracts, sending blood through the aortic valve into the aorta
7. Systemic circuit (body tissues)
The aorta branches into systemic arteries, arterioles, and capillaries.
Oxygen and nutrients diffuse into tissues; CO₂ and wastes diffuse into the blood
The blood is now deoxygenated again, completing the loop.
8. Back to step 1
The cycle repeats, with the same red blood cell now in the same tissue capillaries, ready for another round trip
Name all four valves in normal blood-flow order
Tricuspid → pulmonic → mitral/bicuspid → aortic
Explain when and where blood changes from deoxygenated to oxygenated and back again.
Blood becomes oxygenated in pulmonary capillaries at the lungs and becomes relatively deoxygenated after systemic tissues extract oxygen.
A clot travels from a deep vein to the vena cava and enters the right side of the heart. Which major vessel will it enter after leaving the right ventricle?
Pulmonary trunk/arteries