Compare the structure and function of arteries, veins, and capillaries
What will be an ideal response?
Arteries and veins both contain three tunics or layers in their walls (intima, media and externa) while capillary walls are comprised of only endothelial cells within a basement membrane. Artery walls are thicker than vein walls, allowing them to withstand the changing arterial pressure as the heart beats. Veins contain valves that aid in the return of blood to the heart. Capillary walls are necessarily thin, facilitating the exchange of materials between the blood and the surrounding tissues.
You might also like to view...
Excessive growth factors or growth factor receptors implicated in the development of cancer can be caused by which of the following?
a) nucleosomes b) tumor-suppressor c) oncogenes
Inflammation of the skin is called dermatitis or ________.
A. vitiligo B. bullae C. decubitus ulcer D. eczema E. psoriasis
Phospholipids are able to form bilayer membranes in aqueous environments because
a. they have hydrophobic heads and hydrophilic tails. b. they have polar heads and nonpolar tails. c. they have polar tails and nonpolar heads. d. the phospho-portion can form phosphodiester bonds between adjacent phospholipids. e. two of these.
Autoregulation refers to
A) maintaining constant GFR. B) actions of the parasympathetic nervous system. C) secretion of atrial natriuretic peptide at a constant rate. D) secretion of renin at a constant rate.