Biology B5

Name substances taken in by human cells

Oxygen, water, glucose, and amino acids

Name substances excreted by human cells

Urea and CO2

How do multicellar organisms adapt to having a low SA:V ratio for diffusion

They adapt by having specialised exchange surfaces such as the aveoli in the lungs, and by having a transport system to shorten the distance that substances need to diffuse

What brings deoxigated blood into the heart?

The Vena Cava

What brings deoxigated blood to the lungs?

Pulmonary arteries

What brings the blood back into the heart after it has been oxygenated in the lungs?

Pulmonary veins

What sends the blood out of the heart to the rest of the body?

Aorta

Difference between veins and arteries?

Arteries carry oxygen-rich blood away from the heart, while veins carry oxygen-poor blood back toward the heart

What are the four chambers in the heart?

Right and left atrium, and the right and left ventricle

Why does the left ventricle have a much thicker wall than the right?

As it needs to create greater pressure to push the blood round the body