<span>Increased activity of merocrine sweat glands
Merocrine refers to the exocrine glands (or cells) whose secretions are excreted outside of the cell from the secretory cells, then into an epithelial-walled duct(s), and finally onto the surface of the body. Merocrine secretions from the sweat glands are specifically called eccrine.
Sweat glands are structures of the skin that produce sweat in order to cool the body upon evaporation of the sweat. As a person grows older, his sweat glands become less active. This could impair perspiration or sweating, and increases the risks of overheating in the elderly. </span>
The human respiratory system is a series of organs responsible for taking in oxygen and expelling carbon dioxide. The primary organs of the respiratory system are the lungs, which carry out this exchange of gases as we breathe. The circulatory system is made up of blood vessels that carry blood away from and towards the heart. Arteries carry blood away from the heart and veins carry blood back to the heart. The circulatory system carries oxygen, nutrients, and hormones to cells, and removes waste products, like carbon dioxide.
The respiratory system works directly with the circulatory system to provide oxygen to the body. Oxygen taken in from the respiratory system moves into blood vessels that then circulate oxygen-rich blood to tissues and cells.
Answer:
The correct statements are:
- Sensors in the brain detect a lack of oxygen.
- The muscles in his body need more energy and therefore more oxygen.
The amount of oxygen in air and atmospheric pressure decreases with increase in altitude.
So, when Jon hikes up the hill he faces two problems; lack of oxygen in the air and decrease in atmospheric pressure.
Decreased atmospheric pressure makes it difficult for the lungs to breathe in the air and lack of oxygen decrease the blood oxygen level.
In addition, physical activity like hiking increases the oxygen demand of the body.
Due to these factors the respiratory system struggles to meet the oxygen demand of the body. The brain detect the same and triggers the respiratory and circulatory system to work more in order to meet the oxygen demand.
It causes the shortness of breath or heavy breathing, high blood pressure, tiredness, dizziness etc.
Hi!
Gene therapy can be used to introduce foreign DNA into cells of tissues to cure inheritable disease.
Answer:
By researching, I would think that the answer is D. Ice crystals melt as they fall through a warm layer of air and then refreeze into small ice pellets as they pass through a colder layer of air.
Explanation:
<em>During precipitation formation, if temperatures are at or below freezing, 0°C (32°F), at cloud level, water in the air freezes into ice crystals, and the crystals stick together to make snow. The snow starts to fall, and if the air column is freezing cold all the way down from the clouds to the ground, the precipitation stays frozen. It simply falls as snow.</em>
<em />
<em>Sometimes, however, a temperature inversion occurs. Normally, the temperature decreases with increasing altitude. A temperature inversion is when a layer of warm air intrudes between the ground and the clouds.</em>
<em />
<em>Under these conditions, when the falling snow reaches the layer of warm air, it melts. Then it hits the layer of cold air just above Earth’s surface and refreezes. This all happens very fast, and the result is tiny ice pellets called sleet.</em>
