Question 1

What is the largest organ of the human body by both surface area and weight?

Accepted Answer

Skin. Skin is the largest organ of the human body, serving as the primary barrier against environmental pathogens, moisture loss, and physical damage.

Question 2

Which blood type is considered the universal donor for red blood cell transfusions?

Accepted Answer

O negative. O-negative red blood cells lack A, B, and Rh antigens, meaning they can generally be given to patients of any blood type without triggering an acute hemolytic reaction.

Question 3

What is the smallest bone in the human body?

Accepted Answer

Stapes. The stapes (or stirrup) is an auditory ossicle located in the middle ear and is the smallest bone in the human body.

Question 4

What fibrous connective tissue attaches skeletal muscle to bone?

Accepted Answer

Tendon. Tendons are tough bands of dense fibrous connective tissue that connect muscles to bones, whereas ligaments connect bone to bone.

Question 5

Which chamber of the human heart is responsible for pumping oxygen-rich blood into the aorta for systemic circulation?

Accepted Answer

Left ventricle. The left ventricle receives oxygenated blood from the left atrium and contracts to eject it into the systemic circulation via the aorta.

Question 6

Which endocrine cells within the pancreatic islets are responsible for synthesizing and secreting insulin?

Accepted Answer

Beta cells. Beta cells, found in the islets of Langerhans within the pancreas, produce and secrete insulin to regulate blood glucose levels.

Question 7

What is the typical lifespan of a mature human red blood cell (erythrocyte) in normal circulation?

Accepted Answer

Approximately 120 days. Human erythrocytes typically circulate for about 100 to 120 days before being sequestered and broken down by macrophages, primarily in the spleen and liver.

Question 8

In which part of the human gastrointestinal tract does the vast majority of nutrient absorption take place?

Accepted Answer

Small intestine. The small intestine is the principal site of chemical digestion and the absorption of nutrients through its extensive mucosal lining and villi.

Question 9

Which cranial nerve provides primary sensory innervation to the face and motor control over the muscles of mastication?

Accepted Answer

Trigeminal nerve. The trigeminal nerve (cranial nerve V) splits into three branches to provide sensation across the face and supplies motor fibers to muscles used for chewing.

The human body