Which of the following processes does not contribute to the exchange in capillary beds of substances between the blood and the tissues?
a. Active transport by white blood cells
b. Endocytosis and exocytosis
c. Diffusion
d. Blood pressure at the arterial end of a capillary
e. Bulk flow through pores in the capillary wall
Answer: a. Active transport by white blood cells
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A. Cells can control which materials are transported. B. Exposure to toxins is limited. C. Exposure to bacteria or viruses is limited. D. All of the above are correct.
Match the microbe with an example of its importance to humans.
A. This group includes beneficial microorganisms that fix nitrogen, make antibiotics, vitamins and enzymes, as well as harmful microorganisms that cause disease such as plague and strep throat. B. Members of this group have caused "mad cow disease" and Creutzfeld Jacob disease. C. Members of this group include decomposers, associate with plant roots and help plants grow, produce antibiotics, help bread rise, and help make wine. D. Members of this microbial group cause serious diseases such as smallpox, AIDS, and Ebola fever. E. Members of this group are photosynthetic, include unicellular and multicellular forms, and are the foundation of aquatic food chains.
What is the general order of genes involved in determining early Drosophila development?
What will be an ideal response?
The influence of testosterone on undifferentiated spermatogonia and Sertoli cells results in the hormone dictating
A) mitosis in immature sperm. B) rate of sperm production. C) when and how much LH and FSH are released. D) the production of ADH. E) the occurrence of ovulation.