Atoms of the same element whose nuclei contain the same number of protons, but different numbers of neutrons, are called
A) isotonics.
B) heterotopes.
C) isotopes.
D) homotopes.
E) heterotonics.
C
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You step on a sharp pin. Which pathway does the pain signal follow?
A. Cuneate fasciculus; medulla oblongata; thalamus; cerebral cortex B. Spinothalamic tract; thalamus; cerebral cortex C. Cerebral cortex; lower motor neuron; ventral horn D. Dorsal spinocerebellar tract; cerebellum E. Gracile fasciculus; medulla oblongata; cerebral cortex
What determines whether a substance can move through the filtration membrane?
A) Size of the substance B) Electric charge of the substance C) Shape of the substance D) Partial pressure of the substance
Estrogen is a steroid hormone, therefore it will readily dissolve through a lipid bilayer.
Answer the following statement true (T) or false (F)
Why does nutrient-rich blood of the hepatic portal vein pass first through the liver before this blood is returned to the heart?
A. To allow the liver to add more wastes to the blood B. The liver needs more nourishment than other tissues; hence nutrients first pass through the liver C. To allow the liver to add more nutrients to the blood D. To allow the liver to store or modify the nutrients