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Why do scientists think arthropods and segmented worms have common ancestor?
Scientists think arthropods and segmented worms have a common ancestor because they share similar developmental patterns and genetic sequences. They both exhibit segmentation in their body structure, suggesting a shared evolutionary history. Additionally, molecular studies have shown similarities in their genetic makeup that indicate a close relationship.
What is the close circulatory system and open circulatory system?
Closed circulatory systems have blood that does not flow in defined blood vessels. Examples are insects and how their organs are bathed continually in "blood". Open circulatory systems have blood that flows in vessels. Humans have this system as blood flows in veins, arteries and capillaries.
What is the difference between open and close circulatory system?
Closed circulatory systems have blood that does not flow in defined blood vessels. Examples are insects and how their organs are bathed continually in "blood". Open circulatory systems have blood that flows in vessels. Humans have this system as blood flows in veins, arteries and capillaries.
What is the main reason why valves close when blood flow through them?
If the valves in the heart do not close, regurgitation occurs which is the blood pooling back into a chamber of the heart where it should not be. This can lead to a whole host of medical problems - like a heart attack.
Why is a blood system unnecessary in either free-living or parasitic flatworms?
Flatworms, both free-living and parasitic, lack a blood system because they have a flat body structure that allows for efficient diffusion of nutrients and gases directly through their skin. Their bodies are thin enough that all cells are close to the external environment, facilitating the exchange of oxygen and waste without the need for a circulatory system. Additionally, many parasitic flatworms absorb nutrients directly from their host, reducing the need for an internal transport system.
What difference between open and close circulatory system?
In closed circulation blood flows through blood vessels as in human beings. But in certain animals as insects blood flows in open spaces without blood vessels.
What is close system in System analysis?
close system are the type of system that do not interact with the environment
What carries blood around in the body?
the CIRCULATORY SYSTEM or sometimes termed as the cardiovascular system. they are smaller parts of this system the things that the blood goes though arteries- carry blood away from heart veins - carry blood back to the heart they also have occasional valves to make sure the blood all goes in one direction capillaries are tiiny vessels that carry blood close to the body's cells in its tissues and organs
Is a car radiator a open system or close?
close system
What is the neurovascular system?
The neurovascular system refers to the close relationship between the nervous system and the blood vessels that supply it. This system is crucial for providing oxygen and nutrients to nerve cells while also removing waste products. It plays a key role in regulating blood flow to meet the metabolic demands of nerve tissues.
How does a caribous heat exchange system stop the blood in its legs from freezing?
the arteries and veins in their legsare close together. Warm blood flowing from their heart heats up the cold blood returning from their legs. by callum matthew eaton
The function of valves in the cardiovascular system is to?
they need to open and close to allow blood to flow through the heartto prevent blood from flowing backwards when traveling through the heartThe heart has four chambers where blood is pumped. The four heart valves are the tricuspid, pulmonary, mitral, and aortic. The valves open and close to let the blood flow in only one direction.to pump blood throughout the body!To keep blood flowing they close between beats so it doesn't drain outThe purpose of the heart valves is to avoid back flow of blood.
