71.How does the concept of surface area most relate to the absorption of nutrients?

a.The presence of fibre in a meal expands the intestinal lumen and thereby the surface area for nutrient absorption.

b.The surface area of nutrient molecules if the main determinant of the process of absorption.

c.Large numbers of villi and microvilli in the small intestine increase the surface area for nutrient absorption.

d.The surface area of pancreatic enzymes is a key factor in their digestive capacity.

72.Which of the following is a significant property of dietary fibre?

a.inhibition of protease activity

b.promotion of water retention of stools

c.inhibition of large intestinal contractions

d.promotion of vitamin excretion in stools

73.To assist the process of digestion and absorption, it is usually best to do which of the following?

a.Eat several snacks per day so the system is not overwhelmed.

b.Combine different food types to enhance the absorption process.

c.Avoid eating meat and fruit at the same meal to prevent competition.

d.Take enzyme pills or powder periodically so the system can rest and rejuvenate.

74.When nutrients are transported from intestinal epithelial cells to the vascular system, what organ is first to receive them?

a.liver

b.heart

c.lungs

d.kidneys

75.Which of the following products of digestion is released directly into the bloodstream?

a.chylomicrons

b.minerals

c.polypeptides

d.soluble fibre

76.Exchange of oxygen, nutrients, and waste materials takes place across the walls of which of the following small vessels?

a.ducts

b.venules

c.arterioles

d.capillaries

77.What vessel carries blood from the liver to the heart?

a.aorta

b.hepatic vein

c.thoracic duct

d.hepatic portal vein

78.The hepatic portal vein empties into which organ?

a.liver

b.heart

c.pancreas

d.lung

79.When alcohol and barbiturates are ingested, they are absorbed from the gastrointestinal tract and transported first to which of the following organs?

a.liver

b.heart

c.spleen

d.kidneys

80.Which of the following conducts lymph into the vascular system?

a.villi

b.mesentery

c.subclavian vein

d.common bile duct