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Name and briefly describe four methods in which molecules and ions may pass through a cell membrane?

A. Osmosis - the movement of water down a water potential gradient through a partially permeable membrane. B. Diffusion - the net movement of molecules or ions down a concentration gradient. C. Active Transp...
Answered by • Human Biology tutor
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Describe the conduction system of the heart and explain how the atria and ventricles contract sequentially.

The heart consists of four chambers, two atria and two ventricle. The conduction system of the heart mediates synchronised contraction of the chambers to allow the heart to effectively pump blood. The conduc...
CS
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What are the stages of mitosis?

I remember this by: I P eed on the MAT, C (read:see) Interphase- 90% of a cell's life is in this metabolic phase Prophase- chromatin condenses, nucleolus disappears Metaphase- chromosomes align at the equato...
MB
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What are the four chambers of the heart and what is the order blood flows through them?

The four chambers of the heart are the right atrium, right ventricle, left atrium and left ventricle.Deoxygenated blood (blood with no oxygen) flows into the right side of the heart via the superior and infe...
KC
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What is an action potential, and what steps are involved?

Action potentials are changes of electrical potential in a cell. The normal resting membrane potential inside cells is around -70mV. This membrane potential is maintained through the action of the Na + K + A...
CL
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