Biology Blood and circulation chapter 5

The circulation system is in charge of pumping the blood around the body the blood transports:

• Oxygen from lungs to the body

• Carbon dioxide from the gut to the body

• Urea from the liver to the large intestine

• Nutrients from the stomache to the body

Explain why single cell organisms do not need a special circulatory system

Answer explanation

Single cell organisms do not have a circulatory system instead materials can easily move around the cell without a special circulatory system single cell organisms obtained by diffusion through the cell surface membrane the ratio of supply to demand can be written as surface area over volume known as the SA to the volume ratio this is how they get absorbed by the organism

Explain the difference between single circulatory systems and double circulatory systems and what makes them more efficient than the other

Answer explanation

Single circulatory systems have two Chambers one arch and one venture goal and it single circulates meaning blood goes around once whilst double circulatory systems have four Chambers two items to ventricles and go around the body twice meaning they double circulate and it makes it more efficient than single circulatory system because the blood is gone around twice and the blood pressure is higher than single circulatory systems while single circulatory systems have a low blood pressure making it less efficient than double circulatory system

What are the two parts of a double circulatory system

Answer explanation

A double circulatory system consists of two parts in the system the pulmonary circulation which is deoxygenated blood leaves the heart through the pulmonary arteries and it circulated through the lungs where it becomes oxygenated. And then we're after it becomes oxygenated the blood returns to the heart through the pulmonary veins.

But it also consists of the systematic circulation which is when the oxygenated blood leaves the aorta and it circulates through all the other parts of the body but then a returns the oxygenated through respiring oxygen plus glucose equals carbon dioxide and water so this is how we get the carbon dioxide and the carbon dioxide comes back through the vene cava and this cycle repeats again and again

Well if the pulmonary vein brings the blood back to the heart but then it goes out through a blood vessel to the body again what is the blood vessel called and what letter is it

• D pulmonary vein

• F aorta

• A pulmonary arteries

• F renal vein

What is letter C called

• Heptica vein

• Heptica portal vein

• Vena cava

• Masenteric artery

What is letter I and d called

• Renal artery and renal vein

• Masenteric artery and heptica vein

• Pulmonary artery and pulmonary vein

• Renal vein and renal artery

When the oxygenated blood comes back to the heart which blood vessel does it go through to get there