in animals that lack a circulatory system how are materials transported

in animals that lack a circulatory system how are materials transported

in animals that lack a circulatory system how are materials transported

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In animals that lack a circulatory system, how are materials transported?

ANSWER: By diffusion

In simple organisms, their bodies have only single cell layer. In them, the materials are transported by simple cell to cell diffusion process. This is found in platyhelminthes(flatworms), porifera and cnidaria and some invertebrates

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In which animal there is no blood for transport of nutrients?

A. Fish
B. Hydra
C. Sponges
D. Both B and C
ANSWER: D

All vertebrates possess a muscular chambered heart. Fishes have a 2-chambered heart with an atrium and a ventricle. In fishes, the blood transports nutrients when the heart pumps blood throughout the body. Animals like hydra and sponges do not possess any circulatory system. The water in which they live brings food and nutrients as it enters their body. The water carries waste materials and carbon dioxide as it moves out. Hence In animals like hydra and sponges, there is no blood for transport of nutrients.

So, the correct answer is ‘Both B and C’.

In all animals, except a few simple types, the circulatory system is used to transport nutrients and gases through the body. Simple diffusion allows some water, nutrient, waste, and gas exchange into primitive animals that are only a few cell layers thick; however, bulk flow is the only method by which the entire body of larger more complex organisms is accessed.

In all animals, except a few simple types, the circulatory system is used to transport nutrients and gases through the body. Simple diffusion allows some water, nutrient, waste, and gas exchange into primitive animals that are only a few cell layers thick; however, bulk flow is the only method by which the entire body of larger more complex organisms is accessed.

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Circulatory System 

The circulatory system is effectively a network of cylindrical vessels: the arteries, veins,

and capillaries that emanate from a pump, the heart. In all vertebrate organisms, as well as

some invertebrates, this is a closed-loop system, in which the blood is not free in a cavity. I

n a closed circulatory system, blood is contained inside blood vessels and circulates unidirectionally

from the heart around the systemic circulatory route, then returns to the heart again.

As opposed to a closed system, arthropods—including insects, crustaceans, and most mollusks—have

an open circulatory system. In an open circulatory system, the blood is not enclosed in the

blood vessels but is pumped into a cavity called a hemocoel and is called hemolymph because the blood mixes with the interstitial fluid.

As the heart beats and the animal moves, the hemolymph circulates around the organs within

the body cavity and then reenters the hearts through openings called ostia. This movement

more :  in the final step of enzymatic catalysis

allows for gas and nutrient exchange. An open circulatory system does not use as much energy

as a closed system to operate or to maintain; however, there is a trade-off with the amount of

blood that can be moved to metabolically active organs and tissues that require high levels of

oxygen. In fact, one reason that insects with wing spans of up to two feet wide (70 cm) are not

around today is probably because they were outcompeted by the arrival of birds 150 million

years ago. Birds, having a closed circulatory system, are thought to have moved more agilely,

allowing them to get food faster and possibly to prey on the insects.

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