10 Questions
What valve closes to prevent backflow of blood into the right atrium?
Tricuspid valve
Where does the blood become oxygenated in the circulatory system?
In the capillaries of the lungs
What is the function of the atrial contraction in both the right and left atriums?
Forcing blood into the ventricles
Which blood vessels carry deoxygenated blood to the lungs for oxygenation?
Pulmonary artery
What initiates the systemic circulation pathway from the heart?
Aortic valve opening
Which part of the aorta gives rise to several major arteries that supply blood to the head, neck, and upper extremities?
Aortic Arch
What is the function of the coronary sinus in the cardiac cycle?
Collects deoxygenated blood from the myocardium
Where is the coronary sinus located in relation to the heart?
In the coronary sulcus on the posterior side of the heart
Which artery is known as the largest artery in the body?
Aorta
What is the main function of the Abdominal Aorta?
Supplies blood to the abdominal organs
Study Notes
Blood Flow and Circulation
- Deoxygenated blood from the body enters the right atrium of the heart via the superior and inferior vena cavae.
- Atrial contraction (atrial systole) forces blood into the tricuspid valve and flows into the right ventricle.
- Ventricular contraction (ventricular systole) closes the tricuspid valve and opens the pulmonary valve, pumping deoxygenated blood to the lungs via the pulmonary artery.
Pulmonary Circulation
- In the lungs, there is an exchange of gases, where blood picks up oxygen and releases carbon dioxide, becoming oxygenated blood.
- Oxygenated blood returns to the left side of the heart via the pulmonary veins, entering the left atrium.
Systemic Circulation
- Atrial contraction in the left atrium forces blood into the left ventricle.
- Ventricular contraction in the left ventricle closes the mitral valve and opens the aortic valve, pumping oxygenated blood out to the rest of the body through the aorta.
Aorta
- The aorta is the largest artery in the body, consisting of four parts:
- Ascending Aorta
- Aortic Arch (gives rise to major arteries supplying blood to the head, neck, and upper extremities)
- Descending (thoracic) Aorta
- Abdominal Aorta (supplies blood to abdominal organs and gives off various branches)
Coronary Sinus
- The coronary sinus is a vein located in the coronary sulcus on the posterior side of the heart.
- It collects blood from the great, middle, and small cardiac veins before emptying into the right atrium.
- This process allows for the efficient removal of metabolic waste and replenishment of oxygen in the myocardium.
Learn about the flow of deoxygenated blood through the heart chambers from the body to the right ventricle. Understand the role of atrial and ventricular contractions in the process.
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