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Doss [256]
3 years ago
12

Which of the following statements is true? Friction works in the direction opposite of motion. Lubrication can be used to increa

se friction. Only large masses exert gravitational force. Air resistance is greatest for objects with small surface areas.
Biology
2 answers:
kenny6666 [7]3 years ago
5 0
The answer is 

A. <span>Friction works in the direction opposite of motion.</span>
bekas [8.4K]3 years ago
4 0
Hello sorry for the late replay but my best answer is going to be
A.)
Friction works in the direction opposite of motion
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The correct option is 3. "At pH 6.5 the enyzme is 50% active"

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For the titratable group to be protonated and cause the enzyme to be in the active state, it needs to have gained a hydrogen cation (H+). In order for that to happen, there must be enough hydrogen cations in the environment of the enzyme, and hence, an acidic pH is required in this case.

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Which of the following is a method used to prevent soil depletion?
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You played hard in Pe today and didn’t get a chance to rehydrate after class. You fell tired and sluggish. How does your body re
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  1. Respiratory system
  2. Nervous system
  3. Circulatory system
  4. Integumentary system
  5. Endocrine system

Explanation:

During excessive hard work or sports, the respiratory system acts to provide sufficient oxygen for energy supply (ATP) - a process takes place in mitochondria. At the very beginning, the respiratory system is active. If the person doesn't intake sufficient water, he will feel tired because of heavy breathing that increases body temperature and affects metabolic reactions. A supply of water would help decrease the respiration need and so support other systems.

The nervous system (hypothalamus) regulates the body temperature which is necessary for metabolic reactions taking place within the body, i.e. homeostasis. During and after exercise, the water intake was not sufficient, this means that the hypothalamus would work to maintain the temperature as well as other metabolic mechanisms. In the case of less water intake, the nervous system would be in stress.

The circulatory system acts to transport blood and oxygen to all parts of the body. During sports activities, the oxygen supply would be high to maintain energy supply. This takes place with the combined action of the circulatory system and respiratory system. For optimal functioning, the circulatory system needs fluids (water) intake because sufficient water is already lost during sports.

The integumentary system is the system that directly protects the body from damages including dehydration. Therefore, in this case, it will be highly active.

The endocrine system consists of glands that produce hormones to control body metabolism. The body metabolism, as mentioned before, is driven through water availability. The reduced water in the body would also put the endocrine system under pressure.

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2 years ago
A mixture that has the same composition throughout is called a(n)
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Homogeneous Mixture

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They are mixed

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2 years ago
An otr® is explaining the purposes of therapeutic exercise and therapeutic activity to a physician. what are the primary reasons
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