It has been suggested that the lymphatic system evolved when animals became larger and the hydrostatic pressure in their circulatory systems rose. Explain how this suggestion is consistent with the function of the lymphatics—
how does high blood pressure make lymphatic function essential? Also, what other advantages were gained by animals that developed lymphatic systems?
What will be an ideal response?
Higher blood pressure results in more filtration at capillary beds, so much so that reabsorption by osmosis is inadequate to maintain plasma volume. Lymphatics' role in fluid balance would be consistent with the hypothesized initial adaptation. The other main advantage of the slow-flowing lymphatic system is immune surveillance against pathogenic microorganisms. Like airport security lines, the slow screening prevents harmful agents from having widespread effects.
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Which type of tissue would you expect to find in an area where the rapid diffusion of substances is required?
A. Stratified cuboidal epithelium B. Simple squamous epithelium C. Pseudostratified columnar epithelial tissue D. Stratified squamous epithelial tissue E. Stratified columnar epithelial tissue
Proof that the ancient Egyptians were stricken with ________ was discovered by examining their skeletons.
A. tuberculosis B. anthrax C. cancer D. Parkinson's disease
About 90% of the cells in the CNS are ____________________ cells
Fill in the blank(s) with correct word
Among the components of the dermis area: sweat glandsb: hair folliclesc: collagen fibersd: sensory nerve endingse: arrector pili muscles
A. a, b, c, e B. a, b, c, d, e C. a, b, d D. a, c, d E. a, b, d, e