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Andrei [34K]
3 years ago
12

When did biologists confirm that living things are composed of cells?

Biology
2 answers:
lianna [129]3 years ago
5 0
The answer is B.
" The cell was first discovered by Robert Hooke in 1665 using a microscope. The first cell theory is credited to the work of Theodor Schwann and Matthias Jakob Schleiden in the 1830s."
Mumz [18]3 years ago
4 0
The answer is 1830s
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The skeletal muscle is one of the three types of muscle in the organism. <em>Option a) is correct. From smallest to largest, the parts of a </em><em>skeletal muscle </em><em>are Myofilament, sarcomere, myofibril, muscle fiber, fascicle, muscle. </em>

<h3>The skeletal muscle</h3>

  • It is the most abundant muscle in vertebrates, constituting the somatic musculature.

  • Among its many functions, it proportionates motion to extremities and digits and is responsible for the position and posture of the individual. It also participates in<em> eye movements, respiration, mastication, deglutition, and phonation</em>.

  • The skeletal muscle contracts voluntarily, and its response is fast.

  • Cells composing the striated muscle are significantly longer and multinucleated. They arrange in bundles, where cells are parallel to each other.

<h3>Composition of skeletal muscle</h3>

  • <em>Myofilaments </em>⇒ Actine and miosine

  • <em>Sarcomere</em> ⇒ It is the functional unit with the contractile apparatus. Composed of the Z band, A and I bands, and H zone.

  • <em>Myofibrilles</em> ⇒ They have the Functional units

  • <em>Muscle fibers</em> ⇒ Surrounded by endomysium

  • <em>Fascicle </em>⇒ Group of fibers surrounded by perimysium.

  • <em>Muscle</em> ⇒ Group of fascicles surrounded by epimysium.

Hence, the correct option is a).<em> From smallest to largest, the parts of a </em><em>skeletal muscle </em><em>are Myofilament, sarcomere, myofibril, muscle fiber, fascicle, muscle.</em>

<em />

<em> You can learn more about the</em><em> skeletal muscle</em><em> at</em>

<em>brainly.com/question/1560716</em>

<em>brainly.com/question/1194286</em>

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2 years ago
Which kind of exercise helps your heart work more efficiently?
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Aerobic<span> or </span>cardiovascular<span> exercises are the most healthy for your body when it comes to your heart helps oxygen flow better</span>
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Causes and effects of acid rain on an ecosystem​
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error

Explanation:

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Which of the following provides evidence for the hypothesis of punctuated equilibrium
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I think the answer is c

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