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Sladkaya [172]
3 years ago
7

Which statements accurately describe matter? Check all that apply. Only living things are made up of matter. Matter is made up o

f tiny particles called atoms. Atoms were discovered in the twenty-first century. Atoms cannot be divided and still retain the properties of its original state. A single atom can be seen only with a standard microscope.
Physics
2 answers:
harkovskaia [24]3 years ago
7 0
The answer is "matter is made up of tiny particles called atoms"
TEA [102]3 years ago
6 0

Answer:

Matter is made up of tiny particles called atoms

Explanation:

All the things, whether living or non-living, are made up of matter. Matter is composed of tiny particles known as atom. Atoms were discovered in 19th century. Atoms are composed of subatomic particles- electrons, protons and neutrons. An atom cannot be observed using a standard microscope as it is very tiny. It can be viewed under an electron microscope.

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ANEK [815]

Hi!


The correct answer would be: the width of I-bands


The sacromere is the smallest contractile unit of striated muscles. These units comprise of filaments (fibrous proteins) that, upon muscle contraction or relaxation, slide past each other. The sacromere consists of thick filaments (myosin) and thin filaments (actin).


<em>Refer to the attached picture to clearly see the structure of a sacromere.</em>


<u>When a sacromere contracts, a series of changes take place which include:</u>

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<em>- The A line remains unchanged</em>

<em>- Z lines come closer to each other (and this is due to the shortening of the I bands) </em>

The only changes that take place occur in the zones/areas in the sacromere (as mentioned), not in the filaments (actin and myosin) that make the up the sacromere; hence all other options are wrong.


Hope this helps!

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