Hemoglobin can carry both oxygen and carbon dioxide in the blood.
Indicate whether the statement is true or false.
Answer: True.
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Anytime the [HCO3-]/[CO2] ratio falls below 10:1, an acidosis exists
Indicate whether the statement is true or false
What type of movement of materials occurs in the midsection of a capillary?
A. Blood pressure pushing blood cells out of the capillary B. Diffusion into and out of the capillary C. Tissue fluid pressure pushing materials into the capillary D. Osmotic pressure drawing materials out of the capillary
Interferons ________.
A) are virus-specific, so that an interferon produced against one virus could not protect cells against another virus B) act by increasing the rate of cell division C) interfere with viral replication within cells D) are routinely used in nasal sprays for the common cold
Sperm cannot fertilize an egg unless they have been in the female reproductive tract for several hours. This enhanced ability of the sperm to fertilize the ovum is called capacitation. In vitro studies indicate that the sperm can fertilize the ovum if they are first washed before being introduced to the ovum. These observations suggest that
A) pH is an important factor in the process of capacitation. B) in capacitation, secretions of the female reproductive tract are taken up by the sperm. C) only sperm that come into contact with vaginal secretions are capable of fertilizing an ovum. D) capacitation is temperature-dependent. E) capacitation involves the removal of some inhibiting substance(s) from the sperm.