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the alveoli (air sacs that follow from the bronchioles)

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 ventri...

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...

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 ...

1. The arrival of an action potential at the synaptic knob opens calcium ion channels in the pre-synaptic membrane and Ca++ flow in from the synaptic cleft 2. Ca++ cause vesicles of neurotransmitters t...