The oxygen-poor blood enters the heart from the body through the SVC, or, the superior vena cava. The oxygen-poor blood then enters the right atrium (RA) of the heart.
Ummmmmmmm im sorry but its to hard
You didn't put the answer options, but the frog life cycle phases are:
- Mating: In this phase two adult frogs, a male and a female, mate in the water or on plates. At this point, the male frog wraps his arms around the female and overlaps over her back.
- Spawning: At this point, the female releases the eggs into the water, ready to be fertilized by the males. Fertilization occurs outside the female's body.
- Eggs: Some fertilized eggs will be devoured by small animals, but those that survive will hatch 7-9 days after fertilization, releasing a frog shape, called a tadpole.
- Tadpole: It is similar to a fish and is formed by tail, mouth and gills. After 7 days of life, you will be able to swim and feed on algae. Four weeks later he will develop teeth and skin. When he reaches 9 weeks he will begin to change his shape, growing in size and developing head and legs. At that moment it will look more like a frog, but it still has a long tail.
- Metamorphosis of the fish: Up to twelve weeks of age it will reach the shape of a frog and start to feed on insects. Gradually it will lose its tail and its tongue will grow. The 16 weeks will become an adult frog, being able to mate and restart the cycle.
Propably high numbers of mitochondrial cells as cardiac cells are constantly working, requiring lots of ATP energy.
Answer:
Explanation:
When blood is pumped into the thin-walled blood vessels of the lungs, carbon dioxide is replaced with oxygen. The pulmonary arteries carry the blood that has been pumped from the right side of the heart to the lungs for the oxygenation which is returned back to the left atrium by the pulmonary veins.
