The following local chemical changes occur during a period of increased cell activity except
a. increased CO2.
b. increased acid.
c. increased O2.
d. increased K+.
e. increased osmolarity.
C
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Miguel is a 25-year-old jogger with a target heart rate of 125 bpm. His resting pulse is 70 bpm. His blood volume is approximately 6.8 liters. At rest, his cardiac output is 6.3 liters/min.
A. What must his stroke volume be? B. What might his EDV and ESV be? C. During his workout, his heart rate increases to 125 bpm and his cardiac output to 12,500 mL/min. Do his SV, EDV, and ESV change with exercise?
Which of the following factors of the internal environment is not homeostatically maintained?
a. its concentration of nutrient molecules. b. its concentration of nitrogen gas, of which 80% of the atmospheric air is composed. c. its concentration of oxygen and carbon dioxide. d. its pH. e. its temperature.
Muscles that oppose one another are
a. synergists b. levers c. hateful d. antagonists e. fixators
Name the stages of postnatal development, and describe the time frame involved for each stage
What will be an ideal response?