An extracellular cation whose concentration gradient drives the secondary active transport of many different solutes is
A) sodium.
B) calcium.
C) potassium.
D) chloride.
E) glucose.
A
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Long reflexes of digestion involve activity of the central nervous system
Indicate whether this statement is true or false.
The receptors that are stimulated by a large drop in the blood level are located in
a. the respiratory center of the brain b. carotid and aortic bodies c. tissue capillaries d. both b and c e. all of the above
A common respiratory condition occurring due to increased secretions and retained secretions in persons who are immobile is:
A) pneumonia B) emphysema C) fibrosis D) bronchospasm
The blastocyst implants in the uterus on about the ________ day of the 28-day menstrual cycle. At this time, the endometrium is ________ and progesterone levels are _______
A. 21st; thick and secretory; high B. 28th; thick and secretory; low C. 14th; thick and secretory; low D. 28th; thin and proliferating; high E. 21st; thin and proliferating; low