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NikAS [45]
2 years ago
10

Oxygen molecules absorbed by moist respiratory surfaces in humans diffuse immediately into

Biology
1 answer:
Luba_88 [7]2 years ago
6 0

Answer:

b. blood capillaries

Explanation:

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One hypothesis that proposes to explain senescence notes that cells that divide throughout the life course have shortened dna se
mylen [45]

Answer:

telomere hypothesis

Explanation:

Telomere hypothesis -

Telomere -

It is the area where there are repetitive nucleotide sequence at the very end of the chromosome that does not allow the ends from fusing with the other chromosomes and even from deteriorating .

<u>according to the hypothesis , the cells have shorter DNA sequence which divide throughout the life .</u>

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6 0
3 years ago
QUESTION 1
nata0808 [166]

Answer:

According to the sliding-filament model of contraction, the muscle contraction occur due to the myosin heads propel the actin myofilaments toward the center of the sarcomere. This pulls the Z disks closer together, shortening  sarcomere and the entire muscle

Explanation:

In the muscle fiber there are two proteins that facilitate the process of contraction, myosin and actin. Myosin is thicker and more abundant than actin, and its interaction is responsible for the process of muscle contraction.

Both molecules, myosin and actin, form bonds -called cross bridges- where the myosin heads produce the mobilization of actin towards the center of the sarcomere. Z discs are associated with actin myofibrils, so they come close, and promote the shortening of the sarcomere.

This process requires the action of calcium ions, which depolarize the muscle cell and consume energy in the form of ATP.

It should be noted that the myosin and actin molecules do not change their length, but their action causes the muscle fibers to shorten during contraction.

Learn more:

Types of muscle contraction brainly.com/question/7117064

7 0
3 years ago
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