An atom of nitrogen attracts electrons more strongly than an atom of hydrogen. In an ammonia molecule (NH3), which of the following best describes the electrical charge of the individual atoms?
A) The nitrogen is slightly more negative.
B) The nitrogen is slightly positive.
C) The hydrogens are strongly negative.
D) The nitrogen becomes neutral.
E) Charges balance out and none of the atoms has any charge.
A
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The blood pressure is lowest in the _____
A) aorta B) arteries C) arterioles D) left ventricle of the heart E) vena cava
Systems biology is also called integrative biology
__________________ Indicate whether the statement is true or false.
The ________ reflex can be considered the body's first line of defense against hemorrhage-induced low blood pressure.
What will be an ideal response?
Nodes of Ranvier are the spaces between sections of axon enwrapped with myelin. Because myelin creates an insulating layer that prevents ion flow, the progress of the action potential "jumps" from node to node, thus speeding up transmission down the axon.You are studying a gene that, when mutant, causes oligodendrocytes to enwrap shorter sections of axon, so that nodes of Ranvier are more closely spaced. What is the likely effect on nerve impulses?
A. They will travel slower. B. They will decrease in amplitude. C. They will travel laterally across connected axons. D. They will travel faster. E. They will increase in amplitude.