Question

multiple choice (2 points each) name callie aaa

1. the two main ingredients to blood clots are fibrin and

a. erythrocytes
b. monocytes
c. thrombocytes
d. eosinophils

1. a patient has a hematocrit of 45. this means that

a. 55% of their blood is plasma
b. 45% of their blood is plasma
c. 45% of their blood is leukocytes
d. 55% of their blood is erythrocytes

1. after all the cells are removed from blood the remaining fluid is called

a. interstitial fluid
b. lymph fluid
c. plasma
d. serum

1. the membrane that covers the surface of the heart and is also known as the epicardium is the

a. parietal pericardium
b. visceral pericardium
c. the parietal pleura
d. the endocardium

1. which is the most common leukocyte in the blood?

a. neutrophils
b. lymphocytes
c. monocytes
d. erythrocytes

1. where are erythrocytes and thrombocytes formed?

a. bone marrow
b. the kidney
c. lymphoid tissue
d. muscle tissue

1. as blood travels back to the heart from the lungs in the pulmonary veins, it next enters the

a. right atrium
b. left atrium
c. right ventricle
d. left ventricle

1. blood is pumped by the left ventricle into the

a. pulmonary trunk
b. pulmonary vein
c. aorta
d. right atrium

1. the area of the heart where the large vessels enter and exit the heart is known as the

a. interventricular sulcus
b. apex
c. base
d. pericardium

1. oxygen and carbon dioxide travel across the wall of a blood vessel and are exchanged with the tissues in

a. arteries
b. veins
c. capillaries
d. all of the above

1. where does oxygenated (high in oxygen) blood enter the heart from the lungs?

a. the right ventricle
b. the left ventricle
c. the right atrium
d. the left atrium

1. the thick, middle lining of the heart is called the

a. myocardium
b. epicardium
c. endocardium
d. pericardium

Explanation:

1. Blood clots are formed by fibrin and thrombocytes (platelets). Thrombocytes play a crucial role in the clotting process.
2. Hematocrit is the percentage of erythrocytes (red blood cells) in the blood. If hematocrit is 45, then plasma is \(100 - 45=55\%\) of the blood.
3. Plasma is the fluid part of blood from which cells have been removed. Serum is plasma without fibrinogen.
4. The visceral pericardium covers the surface of the heart and is also known as the epicardium.
5. Neutrophils are the most common leukocytes (white blood cells) in the blood.
6. Erythrocytes (red blood cells) and thrombocytes (platelets) are formed in the bone marrow.
7. Oxygenated blood from the lungs (in pulmonary veins) enters the left atrium.
8. The left ventricle pumps blood into the aorta.
9. The base of the heart is where the large vessels enter and exit.
10. Capillaries are the site of gas exchange (oxygen and carbon dioxide) between blood and tissues.
11. Oxygenated blood from the lungs enters the left atrium.
12. The myocardium is the thick, middle - lining (muscular layer) of the heart.

Answer:

1. C. Thrombocytes
2. A. 55% of their blood is plasma
3. C. Plasma
4. B. Visceral pericardium
5. A. Neutrophils
6. A. Bone marrow
7. B. Left atrium
8. C. Aorta
9. C. Base
10. C. Capillaries
11. D. The left atrium
12. A. Myocardium