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Describe how oxygen in the air reaches the capillaries surrounding the alveoli in the lungs.

Oxygen moves down the trachea, into the bronchi and into the smaller bronchioles, down a pressure gradient. Once the oxygen reaches the alveoli it moves down a diffusion gradient across the alveolar epitheli...
SJ
Answered by Sasha J. • Biology tutor
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What is a reflex?

An unconsious action in response to a stimulus. These are very quick movements and have evolved to allow basic protection. For example, when you touch something hot, you automatically remove your hand before...
SC
Answered by Siobhan C. • Biology tutor
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What is a synapse?

A synapse is the area between two nerve cells, allowing electrical impulses to be passed between them. In order to cross the gap from one neuron to another, the impulse gets converted to neurotransmitter - t...
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Answered by Siobhan C. • Biology tutor
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Janice has cystic fibrosis. Cystic fibrosis is caused by a recessive allele (f). What is the probability of her baby having cystic fibrosis? The baby’s father is heterozygous for cystic fibrosis.

Answer = 50% chance of developing cystic fibrosis
VP
Answered by Vishal P. • Biology tutor
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Outline the Stages of Mitosis

Pre-Mitosis: Interphase: - DNA as uncondensed chromatin - DNA contained within nucleus - Centrosomes etc duplicated - Cell enlarged Stages of Mitosis Prophase: - DNA Supercoils & chromosomes condense - C...
DW
Answered by Daisy W. • Biology tutor
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