Which of the following statements about platelets is INCORRECT?

Which of the following statements about platelets is INCORRECT?

- Platelets are essential for clotting process.
- Platelets are fragments of a larger cell called megakaryocyte.
- The life span of platelets is 30 to 60 days.
- The formation of platelets is regulated by the hormone thrombopoietin.
- Platelets contain serotonin, ADP, calcium and PDGF.



Answer: The life span of platelets is 30 to 60 days.

Which of the following is NOT a characteristic of blood?

Which of the following is NOT a characteristic of blood?

- Its temperature is slightly higher than the body's temperature.
- Blood is thicker than water.
- The pH of blood varies between 7.15 to 7.25.
- The color of blood varies from scarlet red to dark red.



Answer: The pH of blood varies between 7.15 to 7.25.

Which of the following is a protective function of blood?

Which of the following is a protective function of blood?

- Preventing infection
- Maintaining normal pH in the body
- Delivering oxygen from the lungs to all body tissues
- Maintaining normal body temperature
- Transporting hormones from endocrine organs to target tissues



Answer: Preventing infection

Which leukocyte contains histamine in its granules?

Which leukocyte contains histamine in its granules?

- Monocytes
- Basophils
- Neutrophils
- Eosinophils
- Lymphocytes



Answer: Basophils

When red blood cells transport respiratory gases

When red blood cells transport respiratory gases

- both oxygen and carbon dioxide combine to the globin portion.
- carbon dioxide binds to the heme portion and oxygen binds to the globin portion.
- both oxygen and carbon dioxide combine to the heme portion.
- oxygen binds to the heme portion while carbon dioxide binds to the globin portion.



Answer: oxygen binds to the heme portion while carbon dioxide binds to the globin portion.

The terms biconcave and anucleated apply to

The terms biconcave and anucleated apply to

- white blood cells.
- leukocytes.
- thrombocytes.
- red blood cells.
- platelets.



Answer: red blood cells.