Open circulatory system is not of physiological hinderance in Cockroach becausea)Circulatory and respiratory systems are not connectedb)Heart is simple but chamberedc)blood is colourlessd)Excretion occurs through malpighian tubulesCorrect answer is option 'A'. Can you explain this answer?

Question

Answer

The open circulatory system is a type of circulatory system in which nutrients and wastes move freely in the body cavity and not blood vessels. This type of circulatory system is found in insects, mollusks, etc. In the case of cockroach, the open circulatory system is not of a physiological hindrance as circulatory and respiratory systems are not connected. Respiration mainly takes place by special respiratory organs known as spiracles.

Answer

The correct option is A) circulatory and respiratory system are not connected because

The open circulatory system is a type of circulatory system in which nutrients and wastes move freely in the body cavity and not blood vessels. This type of circulatory system is found in insects, mollusks, etc. In the case of cockroach, the open circulatory system is not of a physiological hindrance as circulatory and respiratory systems are not connected. Respiration mainly takes place by special respiratory organs known as spiracles.

Answer

The open circulatory system in cockroaches is not a physiological hindrance because the circulatory and respiratory systems are not connected. Let's explore this in more detail:

1. Circulatory and respiratory systems are not connected:
In cockroaches, the circulatory system consists of a long, tubular heart that pumps hemolymph (a fluid similar to blood) into open spaces called sinuses. These sinuses surround the organs and tissues, and the hemolymph bathes the cells directly. The respiratory system, on the other hand, involves a network of tubes called tracheae that deliver oxygen directly to the cells. Unlike in humans, there are no blood vessels involved in gas exchange. Therefore, the open circulatory system does not hinder the respiratory process.

2. Heart is simple but chambered:
The cockroach heart is a simple, elongated tube that runs along the dorsal side of the body. It consists of several chambers separated by valves. The contraction of the heart pumps the hemolymph into the sinuses. Although the heart is relatively simple compared to the human heart, the presence of chambers and valves allows for efficient circulation and prevents backflow of hemolymph. Therefore, the simplicity of the heart does not hinder the functioning of the open circulatory system.

3. Blood is colorless:
In cockroaches, the hemolymph is colorless because it does not contain red blood cells like in vertebrates. Instead, it primarily consists of plasma, which transports nutrients, hormones, and waste products. The lack of red blood cells does not hinder the circulatory system's function since oxygen is directly delivered to the cells through the tracheal system.

4. Excretion occurs through Malpighian tubules:
Cockroaches eliminate waste through specialized structures called Malpighian tubules. These tubules filter waste products from the hemolymph and excrete them along with digestive waste into the hindgut. This system is separate from the circulatory system and does not hinder its function.

In conclusion, the open circulatory system in cockroaches is not a hindrance because the circulatory and respiratory systems are not connected. The simplicity of the heart, the colorlessness of the hemolymph, and the excretion process through Malpighian tubules do not impede the functioning of the open circulatory system.

Answer

The open circulatory system is a type of circulatory system in which nutrients and wastes move freely in the body cavity and not blood vessels. This type of circulatory system is found in insects, mollusks, etc. In the case of cockroach, the open circulatory system is not of a physiological hindrance as circulatory and respiratory systems are not connected. Respiration mainly takes place by special respiratory organs known as spiracles.

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