Top answers

Describe the cardiac cycle in the human heart

The human heart beats around 60-100 beats per minute. Blood enters the right atrium via the superior vena cava and the inferior vena cava, the blood moves through the tricuspid valve into the right ventricle...
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Answered by Shane D. • Biology tutor
2464 Views

What are the main components of blood and explain their functions.

Blood consists of cells such as red blood cells, white bloods cells and platelets and plasma. Red blood cells are important for the delivery of oxygen to the cells in the body - to enable respiration and the...
SM
Answered by Shivani M. • Biology tutor
3583 Views

Why do elements give off coloured light when heated?

When elements are heated, it causes their electrons to become excited. Electrons exist in discrete energy levels, and these energy levels are unique to each element. When the electrons are excited by heat, t...
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Answered by Gemma C. • Chemistry tutor
17025 Views

How does water move from the soil into plant roots?

The water moves into root hair cells by osmosis, as there is a high concentration of minerals/sugars in the cells, and little water. This decreases the water potential inside the cell, so water molecules mov...
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Answered by Timothy C. • Biology tutor
39046 Views

What advice do you have for preparing for a Spanish speaking assessment?

My biggest piece of advice would be to practice speaking your presentation with your written script in front of you at first. This way, you can focus on pronunciation, intonation, and where to pause for brea...
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Answered by Sophie K. • Spanish tutor
2536 Views