transport in mammals

Front

What is the main function of arteries in the circulatory system?

Back

Arteries carry oxygenated blood away from the heart to the tissues of the body.

Front

What occurs during ventricular systole in the heart?

Back

During ventricular systole, the ventricles contract, increasing pressure and forcing blood into the aorta and pulmonary artery.

Front

What does the P wave represent in an ECG tracing?

Back

The P wave represents the depolarization and contraction of the atria.

Front

What is a dissociation curve in relation to hemoglobin?

Back

A dissociation curve shows the relationship between the partial pressure of oxygen and the percentage saturation of hemoglobin with oxygen.

Front

What is the role of the mitral (bicuspid) valve?

Back

The mitral valve prevents backflow of blood from the left ventricle into the left atrium during ventricular contraction.

Front

What type of blood vessel has valves to prevent backflow?

Back

Veins have valves to prevent the backflow of blood as it returns to the heart.

Front

What is the significance of the aortic pressure during the cardiac cycle?

Back

Aortic pressure increases during ventricular systole, indicating that blood is being pumped from the heart into the systemic circulation.

Front

What is the primary role of capillaries in the circulatory system?

Back

Capillaries facilitate the exchange of oxygen, carbon dioxide, nutrients, and waste products between blood and tissues.

Front

What happens to the semilunar valves during ventricular diastole?

Back

The semilunar valves close during ventricular diastole to prevent backflow of blood from the aorta and pulmonary artery into the ventricles.

Front

What is the function of the pulmonary valve?

Back

The pulmonary valve controls blood flow from the right ventricle into the pulmonary artery.