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kupik [55]
3 years ago
9

which of the following structures allow materials to be exchanged easily with cells? arteries atria veins capillaries

Biology
2 answers:
abruzzese [7]3 years ago
7 0
Atria is a large part of the heart so too big for cells; arteries & veins lead away or to the heart.
Capillaries are the smallest vascular structures that allow materials to be exchanged easily between cells.
4vir4ik [10]3 years ago
4 0

Answer:

Capillaries

Explanation:

Capillaries are the smallest blood vessels in the human body. They connect arterioles (smallest arteries) to the venioles (smallest veins). They are made of inner endothelial layer and outer epithelial layer, thus they are only two layers thick. They play important role in circulation. The capillaries transport gasses, fluids, and nutrients in the body tissues and also facilitates exchange of gases (oxygen and carbon dioxide), diffusion of fluids and nutrients into the body tissues and transport of waste materials.    

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virus is a microscopic particle that can infect the cells of a biological organism.

Viruses can only replicate themselves by infecting a host cell and therefore cannot reproduce on their own.

At the most basic level, viruses consist of genetic material contained within a protective protein coat called a capsid; the existence of both genetic material and protein distinguishes them from other virus-like particles such as prions and viroids.

They infect a wide variety of organisms: both eukaryotes (animals, fungi and plants) and prokaryotes (bacteria).

A virus that infects bacteria is known as a bacteriophage, often shortened to phage.

The study of viruses is known as virology, and those who study viruses are known as virologists.

It has been argued extensively whether viruses are living organisms.

Most virologists consider them non-living, as they do not meet all the criteria of the generally accepted definition of life.

They are similar to obligate intracellular parasites as they lack the means for self-reproduction outside a host cell, but unlike parasites, viruses are generally not considered to be true living organisms.

A primary reason is that viruses do not possess a cell membrane or metabolise on their own - characteristics of all living organisms.

Examples of common human diseases caused by viruses include the common cold, the flu, chickenpox and cold sores.

Serious diseases such as Ebola, AIDS, bird flu and SARS are all also caused by viruse

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