An ectopic pregnancy results when
A) an oocyte that has not been fertilized implants in the uterus.
B) more than one oocyte is fertilized.
C) a fertilized ovum begins to develop in a blocked uterine tube.
D) a fertilized ovum begins to develop while attached to the cervix.
C) a fertilized ovum begins to develop in a blocked uterine tube.
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A wound created by the drag of a knife across skin can be classified as
A. puncture. B. incised. C. lacerated. D. contused.
Answer the following statements true (T) or false (F)
1. Plant cell membranes contain cholesterol. 2. Diffusion is the movement of a molecule from an area of high to low concentration. 3. Osmosis describes the movement of water from an area of high to low solute concentration. 4. Movement of molecules down their concentration gradient can drive the movement of a different molecule against its concentration gradient.
Which of the following statements about the bicarbonate-carbonic acid buffer system is false? a. Rapid, deep breathing makes the pH of the blood rise
b. Bicarbonate can bind to excess hydrogen ions, preventing blood pH from becoming too acidic. c. None of the choices. d. Carbon dioxide can dissolve in the blood as carbonic acid.
Phytoplankton consists of tiny animals that swim through ocean water
a. true b. false