Question

Which of the following parts of the digestive system is considered an accessory digestive structure?

	mouth
	stomach
	small intestine
	liver
	large intestine

Question

2 of 30

Which of the following is a function of the lymph vascular system?

	Collecting water and solutes from the veins of the blood
	Absorbing carbohydrates from the small intestine
	Being a major site for T and B cell activation
	Transporting foreign materials to lymph nodes
	Returning water and solutes to the small intestine

Question

3 of 30

Oxygen is mostly transported through the body

	dissolved in the blood.
	dissolved in red blood cells.
	bound to hemoglobin.
	bound to dissolved iron.
	bound to carbon.

Question

4 of 30

Which of the following substances is never secreted in the nephron?

	uric acid
	drug metabolites
	hydrogen ions
	potassium ions
	glucose

Question

5 of 30

The one-way flow of blood in veins is maintained by ______________.

	positive pressure from the chest cavity
	blood pressure
	muscles pressing against the veins
	their thick walls
	valves

Question

6 of 30

Absorption of water is one major function of which of the following structures?

	cecum
	esophagus
	appendix
	rectum
	colon

Answer 1

ANSWER :

1. The liver is the largest gland in the body, which considered as the accessory organ of the digestive system because it's not a part of alimentary canal or gastrointestinal tract but produces bile juice that assists in the digestion of dietary lipids.

2. Lymphatic vascular system transport foreign materials or pathogens to lymph nodes, where they filtered and eliminated via the action of lymphocytes (immune cells). Hence option (4) is the correct answer.

3. About 98% oxygen transported in the body via binding to the hemoglobin (a chromoprotein present in RBCs)  in the form of oxyhemoglobin and remaining 2% transported via dissolving in the blood plasma.

4. Glucose (monosaccharide) is never secreted through the nephrons of kidney, because this is completely reabsorbed via the proximal convulated tubule (PCT) into peritubular capillaries of nephron.