Top answers

what is the site of gas exchange in the lungs

the alveoli (air sacs that follow from the bronchioles)
SE
Answered by Sito E. • Biology tutor
2920 Views

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...
SD
Answered by Shane D. • Biology tutor
2463 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
3580 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...
TC
Answered by Timothy C. • Biology tutor
39032 Views

How does an electrical impulse travel from one neuron to the next (IB-SL 6.5)?

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 to fuse wi...
AK
Answered by Adam K. • Biology tutor
2218 Views