Which of the following structures help direct blood flow forward and prevent the backflow of blood within the heart?
a. Septa
b. The coronary arteries
c. The atrioventricular valves
d. The pulmonary vein and the pulmonary artery
Question 2
The walls of the capillaries are only one cell thick. This allows the exchange of nutrients and oxygen and waste products. The capillaries serve as the bridge between:
a. arterioles and venules.
b. the atrium right and the left atrium.
c. the pulmonary vein and the pulmonary artery.
d. arteries and veins.
Electronmicrograph showing a blood clot composed of fibrin, red blood cells, and tissue debris.
Internal structures of main sequence stars, convection zones with arrowed cycles and radiative zones
blood vessels
coagulase negative Staphylococcus on Blood agar
Functions and Properties of Blood
Chemical structures of the pyrimidines and purines