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3 years ago

Which one of the following is a major difference between the circulatory systems of earthworms and fish?

1 answer:

6 0

a. Fish have a single central heart; earthworms have several hearts.


Multi cellular organisms are made up of billions of cells each specialized to a unique role and these cells are organized into structural and functional units such as tissues and organs.
For each cell and organ to function optimally, it requires oxygen and nutrients and needs carbon dioxide and metabolic waste taken away in a continuous, never ending process.
A mechanism is needed to accomplish the important function of transporting the relevant materials to and from the cell. The circulatory system fits this bill splendidly. It is a specialized organ system which allows blood and lymph to flow through the entire body carrying nutrients such as glucose, amino acids and electrolytes as well as oxygen to each cell, at the same time carting away carbon dioxide and all sorts of metabolic waste over to excretory organs to be expelled from the body.

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Protists that move with cytoplasmic extensions are called

Stella [2.4K]

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4 years ago

Terry starts to get nervous about his upcoming recital. His heart starts to beat quickly and he begins to sweat. Which nervous s

pogonyaev

Answer:

sympathetic nervous system

Explanation:

The sympathetic nervous system makes up part of the autonomic nervous system, which is also known as the involuntary nervous system. The sympathetic nervous system directs the body's rapid involuntary response to dangerous or stressful situations (fight or flight response).

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3 years ago

What is the missing word? In mature animals, cell division is mainly restricted to repair and __________ of old cells

Bess [88]

Answer:

swim fast

Explanation:

swim fast

5 0

3 years ago

Read 2 more answers

How many CO2 molecules are produced when three glucose molecules undergo cellular respiration? Explan

Svetlanka [38]

Answer:

18 molecules of $CO_{2}$

Explanation:

In heterotrophic nutrition, organisms ingest or absorb food made by autotrophs to obtain energy. Planta and other photosynthesizing organisms make sugars via photosynthesis, in a form of (partly) light-dependent biosynthesis.

In mitochondria, they break down sugars through aerobic respiration. For the sugar glucose, this results in the production of carbon dioxide and water along with energy in the form of ATP or adenosine triphosphate.

C6H12O6 (glucose) + 6 O2 → 6 CO2 + 6 H2O + ≅38 ATP

glucose+ oxygen → carbon dioxide+ water+ energy

For 3 molecules of glucose, multiply the number of reactants and products...

(C6H12O6+ 6 O2 → 6 CO2 + 6 H2O + ≅38 ATP ) x 3

Thus...

3 C6H12O6+ 18 O2 → 18 CO2 + 18 H2O + ≅114 ATP

7 0

3 years ago

Which structures produce a fluid to protect the body in the first line of defense? Check all that apply. hair stomach mouth eyes

ludmilkaskok [199]

Answer:

The correct options are: stomach, mouth, eyes, skin

Explanation:

Eyes: Our tears contain an enzyme which is beneficial in breaking down the cell wall of many bacteria's.The blinking of the eye also stops many bacteria's o enter into the eye.

Skin: The skin of a person acts as a barrier between any foreign pathogen and the body of a person. The hair present on the skin tend to trap many microorganisms and prevent them from entering into the body.

Mouth: Our mouth produces saliva which has many enzymes to kill pathogens in food.

Stomach: The stomach acids tend to kill any pathogens which enter through swallowing.

7 0

4 years ago