Which of the following lists examples of body structures from the simplest to the most complex?
A. Mitochondrion, connective tissue, protein, stomach, adipocyte (fat cell)
B. Protein, mitochondrion, adipocyte (fat cell), connective tissue, stomach
C. Protein, adipocyte (fat cell), stomach, connective tissue, mitochondrion
D. Protein, stomach, connective tissue, adipocyte (fat cell), mitochondrion
E. Mitochondrion, connective tissue, stomach, protein, adipocyte (fat cell)
Answer: B
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How does a rightward shift in the oxygen hemoglobin dissociation curve affect hemoglobin's affinity to oxygen?
A. Increase B. No change C. Decrease
What is the advantage of breathing through the nose rather than the mouth?
A) The nose warms, humidifies, and filters inhaled air. B) The nose provides a site for initial gas exchange. C) The nose is a less turbulent environment than the mouth. D) The nose provides a more direct route over which air will travel.
The technical term for "breathing" is
A) gas exchange. B) pulmonary ventilation. C) internal respiration. D) external respiration. E) alveolar ventilation.
The first event in muscle fiber contraction is that
A) the muscle fiber membrane is stimulated and a muscle impulse travels deep into the fiber through transverse tubules. B) acetylcholine diffuses across a gap at a neuromuscular junction. C) calcium ions diffuse from sarcoplasmic reticulum into the sarcoplasm and bind to troponin molecules. D) acetylcholine is released from the end of the motor neuron.