Adult giraffes can be up to 20 ft. tall, and thus require special adaptations to maintain appropriate blood pressure. One adaptation is the rete mirabile, a group of blood vessels that form a web or net-like structure to slow blood flow.Although especially useful to the giraffe, the rete mirabile is similar to a countercurrent heat exchange system in other related, less evolved, mammals. Thus a mechanism for ________ homeostasis is likely to have evolved from a mechanism previously used for ________ homeostasis.
A. blood pressure; temperature
B. blood pressure; pH
C. temperature; blood pressure
D. pH; blood pressure
Answer: A
You might also like to view...
A chronometer is used for:
a. measuring depth. b. measuring speed. c. measuring time. d. measuring latitude. e. measuring longitude.
Excess energy is stored in ___ mainly in ___
a. chemical bonds---adipose tissue b. chemical bonds---carbohydrates c. carbon atoms---adipose tissue d. carbon atoms---carbohydrates e. hydrogen bonds---water
Why do tumor cells in mammals have telomerase activity?
What will be an ideal response?
Ropelike assemblies of fibrous polypeptides in the cytoskeleton that provide support and strength to cells; so called because they are intermediate in size between actin filaments and microtubules.
What will be an ideal response?