Answer:
There are three main types of blood vessels:
1)Artery ---
i) It is a blood vessel having a thick wall.
ii) It carries blood from the heart to different parts of the body.
iii) On regulatory demand of the body it can dilate or constrict.
iv) It doesn't contain any valve.
v) All arteries carry oxygenated blood except the pulmonary artery.
2)Vein ---
i) It is a blood vessel having a thin wall.
ii) It brings blood from different parts to the heart.
iii) It can't dilate or constrict under normal conditions.
iv) It contains valves that allow the blood to flow in one direction towards the heart.
v) All veins carry deoxygenated blood except the pulmonary vein.
3)Capillary ---
i) It is a very narrow blood vessel that has very thin walls.
ii) It forms a network throughout the body in all living cells connecting arteries to veins.
iii) It can dilate or constrict according to the requirement of tissue.
iv) It doesn't have any valve.
v) It contains mixed blood as it connects arteries and veins
Answer:
Plants are called Producers because they can produce food energy. Animals are called Consumers because they can only consume food energy. Animals that eat plants are called Herbivores or Primary Consumers. Animals that eat other animals are called Carnivores.
Explanation:
Phoebus Levene was the one who proposed <span>the polynucleotide model stating that dna and rna were composed</span>
Answer:
Human has 4 chambers, and most reptiles have 3 chambers in their heart
Explanation:
your question in Romanian translated roughly What is the difference between a human and reptile circulatory system?
