Question

question 91
0.25 pts
after blood leaves the lungs and returns to the heart, it enters the
right atrium.
left atrium.
right ventricle.
left ventricle.
question 92
0.25 pts
which of the following is not a formed element found in the blood?
red blood cell
white blood cell
plasma
platelet
question 93
0.25 pts
a glycoprotein hormone that is secreted to increase oxygen concentration in the tissues is
erythropoietin.
hemoglobin.
spectrin
proerythroblast.

Explanation:

Question 91

The blood flow through the heart: Oxygenated blood from the lungs returns via the pulmonary veins to the left atrium. The right atrium receives deoxygenated blood from the body. The ventricles pump blood out (right to lungs, left to body). So after lungs, blood enters left atrium.

Formed elements in blood are cellular components: red blood cells, white blood cells, and platelets. Plasma is the liquid (non - cellular) part of blood, so it's not a formed element.

Erythropoietin is a glycoprotein hormone that stimulates red blood cell production, which increases oxygen - carrying capacity (thus oxygen in tissues). Hemoglobin is a protein in RBCs, spectrin is a structural protein in RBCs, and proerythroblast is a precursor cell. So the hormone is erythropoietin.

Answer:

B. left atrium.

Question 92