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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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Is the Sun a planet? Why or why not? (3-4 sentences)
Molodets [167]

Answer:

No

Explanation:

The Sun is a star there are lots of stars,but the Sun is the closest one to Earth.It made from gases and it always burning

Planets are:Mercury, Venus, Earth, Mars, Jupiter, Saturn, and Uranus

4 0
3 years ago
Can someone please write a paragraph that explains what turbidity, cause I don't understand.
artcher [175]
Turbidity<span> is the cloudiness or </span>haziness<span> of a </span>fluid<span> caused by large numbers of individual </span>particles<span> that are generally invisible to the </span>naked eye<span>, similar to </span>smoke<span> in </span>air<span>.</span>
6 0
3 years ago
Which body system is responsible for protecting the body against infection?
Rainbow [258]

Answer: The immune system

Explanation:

The immune system is a complex network of proteins and cells that defends the body against infection or any invasion. The human defense system in the body is actually made up of entire organs and vessel systems like the lymph vessels. The immune system is made up of organs that control the production and maturation of certain defense cells.

Initially, all living things are subjected to attack from disease causing agents. Even bacteria, so small that more than a million could fit on the head of a pin, have systems to defend against infection by viruses. This kind of protection gets more sophisticated as organisms become more complex.

8 0
4 years ago
Vegetable crops growing on a commercial farm are damged by an unkown disease or pest with a 70 to 90 percent mortailty rate. The
Alexxandr [17]

Answer:

soil and vegetative matter screening for soil structure integrity and invasive pathogens

Explanation:

Repeated use of fertilizer causes the soil to break down and lose it nutrient capacity. This in turn will affect the integrity of the plants, now in a nutrient deficit environment. In addition to this, soil micro-biome environment may also be compromised once soil structure and nutrient is lost. Some of the bacteria, fungi and protozoan in the soil plays a role in defense against invasive pathogens. When this is lost the possibility for infection and increased risk of unknown pest and disease is imminent.

6 0
3 years ago
Read 2 more answers
A plate moves 200 m in 10,000 years. What is its rate in cm/year?
FromTheMoon [43]

Answer:

2cm/year

Explanation:

10,000 years = 200m

The question asks, what is its rate in cm per year?

So first we have to make sure the units are the same, i.e by changing the metres(m) to centimetres(cm)

1m = 100cm

200m = (200x100) <em>20,000 cm</em>

10,000 years = 20,000 cm

Now we divide the latter by the former. (cm/year) i.e, years by centimetres

20,000 ÷ 10,000 = 2

8 0
3 years ago
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