Essentially all exchange of gases and other materials between the circulatory system and tissues of the body or the outside world (e.g., in the lungs) occurs in the
A. capillaries.
B. arteries.
C. veins.
D. heart.
E. lymphatic system.
A. capillaries.
You might also like to view...
Describe the characteristics of the Phylum Platyhelminthes. Check all that apply.
_____ They are acoelomate. _____ They are triploblastic. _____ They have a complete digestive system. _____ They exchange respiratory gases through the body wall.
Microevolution can be said to have taken place when
a. a population experiences a shift in allele frequencies. b. a mutation occurs in a population. c. several mutations occur in a population. d. a feature of an individual animal changes through use or disuse. e. when a population has different forms of the same gene.
The oxidation of ammonia (NH4+) to nitrate (NO3-) and nitrite (NO2-) is called ________.
A. ammonification B. nitrogen fixation C. photosynthesis D. nitrification E. denitrification
Which of the following statements is most likely true?
(a) Water is transported actively against a concentration gradient by diffusion (b) Water flows into the direction of the lowest water potential (c) Active transport is ATP-independent (d) Osmosis requires impermeable membranes (e) Tracheids in the phloem facilitate active transport of water