Question

plz give answers for 4 questions​

Answer 1

Answer:

1 ans:- The valves prevent the backward flow of blood. These valves are actual flaps that are located on each end of the two ventricles (lower chambers of the heart). They act as one-way inlets of blood on one side of a ventricle and one-way outlets of blood on the other side of a ventricle.

2. ans :- Across vertebrates, the fish heart is structurally relatively simple. The heart of teleosts is unique in structure, composed of four chambers in series: venous sinus, atrium, ventricle and bulbus arteriosus. The two chambers acting as pumps are the atrium and ventricle, a simplified version of that seen in tetrapods

4.ans:--- In human beings, the transport of materials such as oxygen, carbon dioxide, food and excretory product is a function of the circulatory system.

The circulatory system consists of the heart, blood and blood vessels.

Heart is the vital organ of human beings and it is the beat of the heart that makes us alive.

The size of our heart is approximately the size of our fist.