Question

describe the structure of heart of lower animals​

Answer 1

Answer:

) The heart is primarily made of a thick muscle layer, called the myocardium, surrounded by membranes. One-way valves separate the four chambers. (b) Blood vessels of the coronary system, including the coronary arteries and veins, keep the heart musculature oxygenated

Answer 2

Answer:

The heart is a muscle (myocardium) and consists of four chambers. The upper two chambers of the heart are called atria (singular= atrium). ... Thelower two chambers of the heart are known as ventricles and are separated from each other by the interventricular septum.

Explanation:

mark as brainlist