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GalinKa [24]
3 years ago
9

Which statement best explains how the number of mitochondria in a cell relates to the specialization of a cell? A. Muscle cells

are easily destroyed. Since mitochondria are protein factories, they aid in the rebuilding of muscle cells. B. Muscle cells function in movement. Since cellular respiration releasing ATP occurs in the mitochondria, the muscle cells have a steady supply of energy. C. Muscle cells must function as a unit. Mitochondria serve as the link between muscle cells, which enable them to carry out the function of moving the skeleton. D. Mitochondria aid in the transport of nutrients through the cell. Since muscle cells require a steady supply of energy, many mitochondria are needed for this job.
Biology
1 answer:
devlian [24]3 years ago
7 0

Answer:

B is the correct option because, in a cell, <u>only mitochondria</u> generate and provide <u>energy</u> for muscle movement.

Explanation:

Mitochondria are known as a powerhouse of the cell because they perform <u>cellular respiration</u> and <u>generate energy as an ATP</u> (Adenosine Triphosphate) molecule. <u>Muscle cells function in movement and burn more energy that's why they have many mitochondria to fulfill energy demands.</u>

On the other hand, options <u>A, C, and D are not correct options </u>because mitochondria do not perform other services such as acting as protein factories, linker cells, nutrients transportation. The activities are performed by other organelles.

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A valid concern that Amelia might have is C. The regulations will be more burdensome than in other business structures.

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It should be noted that under law, <em>corporations</em> can loan and borrow money, enter contracts, sue, own assets, etc. The purpose of a corporation is to make a profit.

The concern for Amelia will be the fact that a corporation is highly regulated. It's usually monitored by government agencies. There are also <em>regulations</em> that are put in place in order to protect the rights of employees. Therefore, this may be a challenge for Amelia since she may not have the freedom like that of a sole proprietor.

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Which climate factor involves a decrease in temperature due to lower air pressure?
Anastasy [175]
I think the answer is B.
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Match each description with the correct form of energy.
melamori03 [73]

chemical energy = 3

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nuclear energy = 2

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7 0
3 years ago
Place the following events of muscle excitation in the correct order.
svetlana [45]

An motion potential in the presynaptic cell activates calcium channels. Ca+ triggers the discharge of Acetylcholine through exocytosis. Ach binds its receptors in the postsynaptic membrane, opening Na+ channels. The Order is 4, 3, 5, 1, 2.

The principal frightened system generates an motion potential that travels to the goal activating the calcium channels ⇒ event (4)

Calcium triggers vesicles fusion to the presynaptic membrane. By exocytosis, vesicles release the neurotransmitter -Acetylcholine- into the synaptic space ⇒ event (3)

Once there, Ach binds to its receptors on the postsynaptic membrane of the skeletal muscle fiber, causing ion channels to open ⇒ event (5)

Positively charged sodium ions move the membrane to get into the muscle fiber (sarcoplasm) and potassium leaves the cell ⇒ event (1)

The distinction in charges, resulting from these ions' transport, positively charges the fiber membrane. The postsynaptic cell depolarizes ⇒ Event (2)

The motion potential enters the t-tubules depolarizing the internal part of the muscle fiber. Contraction initiates while the motion potential depolarizes the internal part of the muscle fiber. Calcium channels spark off in the T tubules membrane, releasing calcium into the sarcolemma.

At this point, the muscle is at rest, and the tropomyosin is inhibiting the appeal strengths between myosin and actin filaments. Tropomyosin is obstructing binding sites for myosin on the skinny filament.

When calcium enters the sarcolemma, it binds to troponin C, and troponin T alters the tropomyosin role through shifting it and unblocking the binding sites.

Myosin heads be a part of the uncovered actin-binding points forming move-bridges, and whilst doing so, ATP turns into ADP and inorganic phosphate, that's released.

Myofilaments slide impulsed through chemical energy accumulated in myosin heads, generating a strength stroke. The strength stroke initiates while the myosin move-bridge binds to actin. As they slide, ADP molecules are released. A new ATP hyperlinks to myosin heads and breaks the bindings to the actin filament.

Then ATP splits into ADP and phosphate, and the energy produced is gathered in the myosin heads, which begins offevolved a new binding cycle to actin.

Finally, Z-bands are pulled towards every other, and the sarcomere and the I-band get shorter, generating muscle fiber contraction.

According to those steps, the appropriate order of activities is 4, 3, 5, 1, 2.

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7 0
1 year ago
What percentage of the energy stored in glucose do humans recover by cellular respiration?
Nady [450]
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  • According to the second law of thermodynamics all of the energy cannot  be converted into work done i.e most of the energy is lost in the form of heat.
  • So, there 63% of the energy present in glucose is lost in the form of heat and 37% of the total energy is used for cellular respiration












8 0
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