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Jun 9, 2020 · Definition. An action potential is the result of a very rapid rise and fall in voltage across a cellular membrane, with every action potential (impulse) similar in size. The response of a nerve or muscle cell to an action potential can vary according to how frequently and for what duration the action potentials are fired.
Revision notes on 5.3.4 Action Potentials for the OCR A Level Biology syllabus, written by the Biology experts at Save My Exams.
Mar 13, 2021 · Adenylyl cyclase: enzyme in cell surface membrane of liver cells that dephosphorylates ATP to cyclic adenosine monophosphate (cAMP) when stimulated by glucagon or adrenaline. Adipose tissue: fat tissue. Consists of adipocytes. Adrenaline: “fight or flight” hormone.
Nov 3, 2023 · An action potential is caused by either threshold or suprathreshold stimuli upon a neuron. It consists of three phases: depolarization, overshoot, and repolarization. An action potential propagates along the cell membrane of an axon until it reaches the terminal button.
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Apr 28, 2017 · Pseudopods have two main functions: (1) locomotion and (2) capture of prey or engulfing of food. For instance, amoeba can crawl by extending the cytoplasm and the contraction of the filaments. The pseudopodbulge outward from the edge of the cell to pull in the entire organism as it goes forward.
When the glucose concentration in the intestine is lower than in the intestinal cells, movement of glucose involves active transport. The process requires energy produced by. Discover how ...
CCEA. The nervous system (CCEA) Reflex actions. The brain and spinal cord form the central nervous system (CNS). The CNS controls and coordinates responses between receptors and effectors....
