Biogeographic Realms Boundaries of Biogeographic Realms Usually

question 58

Multiple Choice

Biogeographic Realms

Boundaries of biogeographic realms usually

• A)are arbitrary,demarcated by Alfred Wallace in the 19th Century.
• B)are based on current country delineation.
• C)follow the boundaries of biomes.
• D)are climatic and topographic barriers.
• E)are based on locations of major high and low pressure zones.

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Definitions:

Cross-bridge

The connection formed between the heads of myosin filaments and actin filaments during muscle contraction.

Repolarization

The process of restoring the resting negative charge inside a cell's membrane after depolarization, crucial for nerve and muscle function.

Depolarizes

Depolarization refers to the process in which a cell's membrane potential becomes less negative, a crucial step in the propagation of nerve impulses.

Resting Membrane Potential

The electrical charge across a neuron's plasma membrane when the neuron is not actively transmitting signals.