BIOL 103 Lecture Notes - Lecture 3: Lacteal, Brush Border, Microvillus
39 views4 pages
25 May 2016
School
Department
Course
Professor
Document Summary
Absorption of the digested products, vitamins, minerals and water occurs in the small intestine. This is assisted by the huge surface area of the small intestine contributed by the villi (contains lacteals, and capillaries) and microvilli. The ability of the small intestine to carry out the bulk of of digestion and absorption is aided by infoldings and specializations along it"s length. Extending from the luminal surface into the lumen of the small intestine are villi. The surface of each villus is covered with a layer of epithelial cells whose surface membranes form small projections called microvilli, collectively known as the brush border. This increases surface area, so that digestion and absorption can proceed rapidly. The center of each villus is occupied by a kind of vessel called a lacteal, and by capillaries. Most of the fat absorbed in the small intestine exists as bulky protein-bound particles that are too large to enter capillaries.
Get access
Grade+20% off
$8 USD/m$10 USD/m
Billed $96 USD annually
Homework Help
Study Guides
Textbook Solutions
Class Notes
Textbook Notes
Booster Class
40 Verified Answers
Class+
$8 USD/m
Billed $96 USD annually
Homework Help
Study Guides
Textbook Solutions
Class Notes
Textbook Notes
Booster Class
30 Verified Answers
Related Documents
Related Questions
Which characteristic distinguishes the circulatory system from the lymphatic system?
A. | Circulatory system transports vitamins, lymphatic system does not | |
B. | Circulatory system is pumped by the heart, lymphatic system has no pump | |
C. | Circulatory system is a transport system, lymphatic system is not | |
D. | Circulatory system contains lacteals, lymphatic system contains capillaries |
What is the role of bile in the bodyâs handling of lipids?
A. | Bile separates fatty acids from glycerol so that they can be absorbed. | |
B. | Bile attaches to a very small proportion of fat in the small intestine and causes it to be excreted. | |
C. | Bile helps keep lipids in small droplets in the small intestine. | |
D. | Bile aids in formation of lipoproteins. |
Identify the correct sequence of events in the digestion of fat.
A. | mixing into chyme, absorption, cephalic phase, digestion | |
B. | cephalic phase, digestion, mixing into chyme, absorption | |
C. | cephalic phase, mixing into chyme, digestion, absorption | |
D. | absorption, cephalic phase, mixing into chyme, digestion |