Top answers

How does water travel up the stem of a plant from the roots to the leaves, wouldn't gravity prevent this?

Water molecules are polar. This means that one end of the molecule is slightly negatively charged (the oxygen atom) and one end of the molecule is slightly positively charges (the hydrogen atoms). The slight...
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Answered by Lauren R. • Biology tutor
57600 Views

How is blood pumped by the heart?

There are 3 main phases in the cardiac cycle: Diastole, Atrial systole, Ventricular systole 1.Diastole: -The heart fills with blood as the atria and ventricles relax. -Blood flows from the major veins(vena c...
VL
Answered by Victoria L. • Biology tutor
3480 Views

What are the stages of mitosis?

There are 5 stages of mitosis. Prophase, Metaphase, Anaphase, Telophase and Cytokinesis. An easy mnemonic is P ee (on the) MAT C at. Prophase - 3 things occur: 1) Chromatin condenses and tightly coils to for...
NK
Answered by Neha K. • Biology tutor
5647 Views

How does the electron transport chain work?

The electron transport chain is a collection of proteins ( complexes ), of which there are 4 types, whose purpose is to pump protons into the intermembrane space. These protons will be used by the ATP syntha...
CB
Answered by Cezar B. • Biology tutor
3597 Views

How is the heart beat controlled?

Cardiac muscle is myogenic i.e has the ability to contract naturally, without external stimuli, such as action potentials arriving via nerves. For the whole heart to contract in an organised manner, there ne...
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Answered by Cezar B. • Biology tutor
3228 Views