Ch 42 Circulatory System (Transport)

Front

What is the sinoatrial (SA) node?

Back

The sinoatrial (SA) node is a group of cells located in the upper right atrium of the heart that acts as the natural pacemaker, initiating the electrical impulses that regulate heartbeats.

Front

What happens if the sinoatrial node is damaged?

Back

Damage to the sinoatrial node can disrupt the rate and timing of cardiac muscle contractions, leading to irregular heart rhythms.

Front

What color do white blood cells appear in a typical blood smear?

Back

In a typical blood smear, white blood cells appear purple due to the staining process.

Front

What is the function of the tricuspid valve?

Back

The tricuspid valve regulates blood flow from the right atrium to the right ventricle, preventing backflow during ventricular contraction.

Front

What is the role of the left atrium in the circulatory system?

Back

The left atrium receives oxygenated blood from the lungs via the pulmonary veins and pumps it into the left ventricle.

Front

What is the significance of the heart's electrical conduction system?

Back

The heart's electrical conduction system coordinates the timing of heartbeats, ensuring efficient blood flow throughout the body.

Front

What are the main components of blood?

Back

The main components of blood are red blood cells, white blood cells, platelets, and plasma.

Front

What is the primary function of red blood cells?

Back

The primary function of red blood cells is to transport oxygen from the lungs to the body's tissues and return carbon dioxide from the tissues to the lungs.

Front

What is the role of platelets in the circulatory system?

Back

Platelets play a crucial role in blood clotting, helping to prevent excessive bleeding when injuries occur.

Front

What is the difference between arteries and veins?

Back

Arteries carry oxygen-rich blood away from the heart, while veins carry oxygen-poor blood back to the heart.