Which of the following plasma proteins is responsible for colloid osmotic pressure?

a: Producing coagulation factors - This function is associated more with the liver, which produces various clotting factors involved in the coagulation process.

b. Destroying dying red blood cells: The spleen is primarily involved in the destruction of old or damaged red blood cells. It acts as a reservoir for blood, where it filters out old or abnormal red blood cells, recycling their components and removing any potentially harmful substances.

c: Producing leukocytes before birth - Leukocytes (white blood cells) are primarily produced in the bone marrow, not the spleen.

d: Storing glycogen - Glycogen storage is mainly associated with the liver and muscles, not the spleen.

a. I, IV, and VII: Cranial nerve I (Olfactory) is involved in the sense of smell, not eye movement. Cranial nerve VII (Facial) controls facial expressions, not eye movement. Cranial nerve IV (Trochlear) does control one of the extraocular muscles.

b. V and V: This is not a valid option, as it repeats the same cranial nerve. Cranial nerve V (Trigeminal) is involved in facial sensation and chewing, not eye movement.

c. IV and V: Cranial nerve IV (Trochlear) is involved in eye movement, but cranial nerve V (Trigeminal) is not.

d. III, IV, and VI: Correct. Cranial nerve III (Oculomotor), cranial nerve IV (Trochlear), and cranial nerve VI (Abducens) all control the extraocular muscles responsible for eye movements.