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Colt1911 [192]
3 years ago
13

A person who is optimistic:

Biology
2 answers:
Serggg [28]3 years ago
7 0

Answer:A

Explanation:

because optimistic people are confident about their future

mart [117]3 years ago
4 0

Answer:

A Or D

Explanation:

A because they will be confident about the future

D because their mental health will be a lot better

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Dennis_Churaev [7]

Answer:

None of these are present

7 0
2 years ago
Drag each label to the correct location on the diagram.
jeyben [28]

The skeletal muscle, responsible for voluntary contraction is composed of 1) Myofilaments 2) Myofibrilles 3) Muscle fibers 4) Muscle (from the left to the right in the image)

<h3>What is the composition of the skeletal muscle?</h3>

The elements composing the skeletal muscle are,

  • Myofilaments ⇒ Actine and miosine
  • Sarcomere ⇒ It is the functional unit with the contractile apparatus. Composed of the Z band, A and I bands, and H zone.
  • Myofibrilles ⇒ They have the Functional units
  • Muscle fibers ⇒ Surrounded by endomysium
  • Fascicle ⇒ Group of fibers surrounded by perimysium.
  • Muscle ⇒ Group of fascicles surrounded by epimysium.

The sarcomere is the contractile unit in a skeletal muscle. The thick myosin myofilaments are located in the central region of the sarcomere, which corresponds to the A band.

Thin filaments united to the Z lines, extends to the interior of the A band until they reach the border of the H band.

The I band is formed solely of thin actin filaments, belonging to two sarcomeres adjacent to a Z line.

When the muscle contracts, the muscular fiber gets shorter and thicker due to the reduction in length of the sarcomere.

  • The H line and the I band get shorter.
  • The Z lines get closer to the A band, meaning that they get closer to each other. The A band keeps constant in length.
  • This change is produced by movement mechanisms that involve a change in the relative position of actin and myosin filaments.

For a better understanding about muscle contraction, look at the attached files.

From the left to the right,

1) Myofilaments

2) Myofibrilles

3) Muscle fibers

4) Muscle

You can learn more about skeletal muscle structure at

brainly.com/question/11246024

brainly.com/question/12213587

#SPJ1

6 0
2 years ago
Which organelle is responsible for carrying out the process of photosynthesis and producing surgars for the plant cell?
Likurg_2 [28]
The Chloroplast is responsible for carrying out the process of photosynthesis and producing sugars for the plant cells.
5 0
3 years ago
What are all living things composed of?
notka56 [123]

Answer:There are four types of complex carbon-based molecules in all living organisms: proteins, carbohydrates, lipids, and nucleic acids

Explanation:Cells are the basic building blocks of living things. The human body is composed of trillions of cells, all with their own specialised function

5 0
2 years ago
Read 2 more answers
The cartilage which divides the nose in two parts is called the
VARVARA [1.3K]
The cartilage of septum!!!
6 0
3 years ago
Read 2 more answers
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