What are the three components of a typical cell?
A) Nucleic acids, organelles, and nucleus
B) Nucleus, plasma membrane, and cell wall
C) Nucleic acids, cells wall, and organelles
D) Nucleus, plasma membrane, and cytoplasm
Answer: D
You might also like to view...
Following strenuous exercise, blood levels of lactic acid are ________ compared to pre-exercise levels. This change in acid concentration causes a reflex ________ in ventilation by activating ________.
A. increased; increase; central chemoreceptors B. increased; increase; peripheral chemoreceptors C. decreased; decrease; peripheral chemoreceptors D. decreased; decrease; central chemoreceptors E. increased; increase; baroreceptors in the aortic arch
Doctors suggest that during long periods of sitting, you should flex and extend your feet at the ankles periodically and squeeze your calf muscles to assist with blood circulation. Why would non-exercise muscle contraction affect blood flow and cardiovascular health?
A. Contraction of muscles stimulates the arteries to vasodilate, reducing blood pressure. B. Contraction of the leg muscles stimulates baroreceptors to signal the autonomic nervous system and decrease blood pressure and heart rate from multiple fronts. C. Contraction of muscles itself increases heart rate and burns calories, keeping the heart strong and assisting in maintaining healthy weight. D. Contraction of the leg muscles squeezes leg veins, which functions as a pumping mechanism to return deoxygenated blood to the heart.
Following an injury to his arm, a patient complains that he has lost the ability to flex his elbow and supinate his forearm. Which nerve do you suspect he has damaged?
A. Musculocutaneous nerve B. Median nerve C. Axillary nerve D. Ulnar nerve E. Radial nerve
Which of the following must occur for muscles to recover from fatigue?
A) ATP is produced via aerobic respiration. B) Lactic acid builds up in the sarcolemma of muscle cells. C) Muscle cells start to make ATP in anaerobic conditions. D) Lactic acid is metabolized to pyruvate or glucose and ATP reserves are restored.