Question

2.Будова кровоносної системи амфібій (записати повністю текст). У зв’язку із появою ___________, що забезпечують засвоєння кисню із повітряного середовища, з’являється ___________ коло кровообігу. Серце складається з _________________. По судинах тече _______________(венозна/артеріальна) кров ________________ киснем. ДАЮ 50 БАЛЛОВ

Answer 1

Ответ:

У зв'язку із появою легень, що забезпечують засвоєння кисню із повітряного середовища, з'являються друге коло кровообігу. Сердце складається з трьох камер двух предсердь і - одного шлуночка. По судинах тече артиріальна кров насичена киснем.

Answer 2

Structure of the Circulatory System in Amphibians

The circulatory system in amphibians is composed of several key components that work together to transport oxygen and nutrients throughout the body. In response to the development of lungs, which allow for the absorption of oxygen from the air, a dual circulatory system emerges. This system consists of both pulmonary circulation, which deals with oxygenation of blood in the lungs, and systemic circulation, which delivers oxygenated blood to the body's tissues.

The heart in amphibians is a three-chambered organ, consisting of two atria and one ventricle. The two atria receive blood from different sources: the right atrium receives deoxygenated blood from the body, while the left atrium receives oxygenated blood from the lungs. The single ventricle then pumps the mixed blood to both the lungs and the body.

Blood Flow and Oxygenation

In amphibians, blood flows through a network of vessels, including arteries, veins, and capillaries. Arteries carry blood away from the heart, while veins carry blood back to the heart. Capillaries are tiny, thin-walled vessels that allow for the exchange of oxygen, nutrients, and waste products between the blood and the body's tissues.

The blood in amphibians is mixed, meaning that oxygenated and deoxygenated blood are not completely separated. This is due to the incomplete division of the ventricle in the heart. As a result, oxygenated and deoxygenated blood mix together before being pumped out to the lungs and the body.

In terms of blood oxygenation, amphibians rely on both cutaneous respiration (gas exchange through the skin) and pulmonary respiration (gas exchange through the lungs). The skin plays a significant role in gas exchange, especially in species that have a thin and moist skin. The lungs, on the other hand, provide a more efficient means of oxygen uptake.

In summary, the circulatory system in amphibians is characterized by a three-chambered heart, dual circulation (pulmonary and systemic), and a mixture of oxygenated and deoxygenated blood. This system allows for the absorption of oxygen from both the air and the surrounding environment, ensuring the delivery of oxygen to the body's tissues.