Chemoreceptors located in the aortic and carotid bodies stimulate the respiratory control center in the brain when the blood __________ decreases.  

A.  PCO2
B.  hemoglobin concentration
C.  pH
D.  PO2
E.  HCO3- concentration


C.  pH

Biology & Microbiology

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What is the key concept addressed by the question?

What will be an ideal response?

Biology & Microbiology

Early seed plants were pollinated by _______, as are present-day conifers.  

A.  beetles B.  bees C.  trilobites D.  wind E.  water

Biology & Microbiology

Mitochondria are responsible for generating _______ for the cell in the form of _______.

a. cytoplasm; ATP b. energy; glucose c. energy; ATP d. cytoplasm; glucose

Biology & Microbiology

When DNA sequences are compared, the closet living relative of humans is found to be the gorilla

__________________ Indicate whether the statement is true or false.

Biology & Microbiology