Isotopes of an element differ in the number of
A) protons in the nucleus.
B) electrons in the nucleus.
C) neutrons in the nucleus.
D) electron clouds.
E) electrons in energy shells.
C
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These muscles increase thoracic cavity dimensions by elevating the first and second ribs during forced inhalation.
A. External intercostals B. Scalenes C. Transversus thoracis D. Internal intercostals E. Serratus posterior inferior
If active transport establishes a concentration gradient with the use of ATP, then the concentration gradient can be looked at as ________
A) potential energy that can be harnessed when molecules passively diffuse down the concentration gradient B) a byproduct of active transport that will be alleviated by pinocytosis C) an unusable byproduct of active transport that will simply diffuse away D) unwanted pressure that will be alleviated by channel mediated facilitated diffusion
Pressure in the right ventricle must exceed pressure in the ____ before the right ventricle can eject blood
A. superior vena cava B. coronary sinus C. pulmonary trunk D. aorta E. pulmonary veins.
What do facilitated diffusion and active transport have in common?
A) Both involve the use of energy provided by ATP. B) Neither require ATP to function. C) Both are examples of carrier-mediated transport. D) Both involve transport of a solute down its concentration gradient. E) Both involve transport of a solute up its concentration gradient.