Question

у каких животных кровь не разносит кислород по всему телу? Чем это можно объяснить? Плиз помогииииите

Answer 1

Кровь не разносит кислород по всему телу у тараканов 
Если люди дышат через рот или нос, а мозг контролирует эту важную функцию, то тараканы дышат через дыхальца, наружные отверстия для дыхания на боку брюшка насекомых и конечно мозг не контролирует это дыхание, и кровь не разносит кислород по всему телу.

Answer 2

Animals with Open Circulatory Systems

There are certain animals that have an open circulatory system, where the blood does not circulate through a closed network of blood vessels. Instead, the blood is pumped into a cavity called a hemocoel, which surrounds the organs and tissues. The blood then directly bathes the organs and tissues, allowing for the exchange of nutrients and waste products. In these animals, the blood does not carry oxygen to the cells in the same way as in animals with closed circulatory systems.

Examples of Animals with Open Circulatory Systems

1. Insects: Insects, such as beetles, butterflies, and ants, have an open circulatory system. Their blood, called hemolymph, flows freely through the body cavity, bathing the organs and tissues. The hemolymph transports nutrients, hormones, and waste products, but it does not carry oxygen to the cells. Instead, insects have a network of tiny tubes called tracheae that directly deliver oxygen to the cells.

2. Mollusks: Mollusks, such as snails, clams, and squids, also have an open circulatory system. Their blood, called hemolymph, is pumped by a heart into the hemocoel, where it bathes the organs and tissues. The hemolymph transports nutrients and waste products, but it does not carry oxygen to the cells. Mollusks have specialized gills or lungs to extract oxygen from the environment.

Explanation for the Lack of Oxygen Distribution

The lack of oxygen distribution in animals with open circulatory systems can be explained by the following factors:

1. Efficiency: In animals with open circulatory systems, the direct delivery of oxygen to the cells through specialized respiratory structures, such as tracheae in insects or gills/lungs in mollusks, is more efficient than relying on the transport of oxygen through the circulatory system.

2. Size and Metabolic Rate: Animals with open circulatory systems are generally smaller in size and have lower metabolic rates compared to animals with closed circulatory systems. The direct delivery of oxygen to the cells is sufficient to meet their metabolic needs.

3. Evolutionary Adaptation: The open circulatory system is an evolutionary adaptation that has allowed these animals to thrive in their respective environments. The direct delivery of oxygen to the cells, along with other physiological adaptations, has proven to be successful for their survival and reproduction.

It's important to note that while animals with open circulatory systems do not distribute oxygen through the blood, they still require oxygen for cellular respiration. They have evolved specialized respiratory structures to ensure an adequate supply of oxygen to their cells.