The primary regulator of the magnitude of ventilation in normal circumstances is the
a. H+ concentration of the brain extracellular fluid monitored by central chemoreceptors
b. of the arterial blood monitored by central chemoreceptors
c. of the arterial blood monitored by peripheral chemoreceptors
d. of arterial blood monitored by central chemoreceptors
e. of arterial blood monitored by peripheral chemoreceptors
A
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What is a collection of similar cells and surrounding substances?
A. extracellular matrix B. organ C. organ system D. tissue E. intracellular matrix
All bones stop growing by the end of adolescence
Indicate whether the statement is true or false
Which of the following is NOT a common characteristic of epithelial tissues?
a) Cells are tightly packed together. b) Large amount of extracellular matrix. c) Contains no blood vessels within tissue. d) Found on the exposed surfaces of the body. e) Line the inside of blood vessels.
Chinese attitudes are relatively accepting concerning:
A. the sale of pornography. B. group sex. C. homosexuality. D. abortion.