Which of the following is a risk factor for osteoporosis?
A. physical inactivity
B. estrogen deficiency
C. excessive consumption of caffeine
D. all of the above
D. all of the above
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Answer the following statements true (T) or false (F)
1. The nucleolus is the “brain” of the cell; it directs all cell activity. 2. The flagella are the “tail” of the sperm cell and act to propel it. 3. Ribosomes are the “protein factories” of the cells. 4. The things that make rough endoplasmic reticulum rough are ribosomes. 5. The nucleolus plays an important role in the formation of ribosomes.
Which of the following does not characterize immediate hypersensitivity?
a. It is mediated by T cells. b. It involves IgE antibodies. c. It occurs within 20 minutes of exposure to the allergen. d. It usually involves allergic responses to inhaled or ingested allergens. e. It includes hay fever, asthma, and hives.
The period of hyperpolarization following an action potential is called
What will be an ideal response?
How do substances move across capillaries?
A) Diffusion B) Through pores C) Transcytosis D) All of the above