When running, heat is produced raising the body's temperature. To maintain homeostasis, the hypothalamus initiates a sweat response to cool the body. As sweat evaporates from skin, heat gets removed, dropping the body's temperature.
Jenny's body is sweating in response to running for more than an hour. This sweating is a mechanism her body uses to maintain homeostasis, or a stable internal state, in terms of temperature. When Jenny runs, her body generates heat, which raises her body's core temperature. To counteract this, her body initiates a cooling process led by the hypothalamus in her brain. This process involves blood vessels dilating to lose heat to the environment and sweat glands secreting fluid. As this sweat evaporates from her skin, it removes thermal energy from her body, cooling it. Therefore, the action causing this homeostasis is the sweat response initiated by the hypothalamus.
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Physical barriers preventing diseases include skin, mucous membranes, microbiome, low stomach pH, blood proteins, urination, and tightly joined endothelial cells lining blood vessels. The body also has external physical barriers like keratin and hair.
Physical barriers that help prevent an individual from contracting diseases include the skin, mucous membranes, and microbiome. The skin acts as a continuous barrier to infectious pathogens and destroys them through desiccation and acidity.
Mucous membranes, found in regions of the body not protected by skin like eyes and mouth, have defense mechanisms such as tears and mucus secretions that trap and eliminate the pathogens. The microbiome, beneficial microorganisms that coexist on the skin and in the gut, compete with invading pathogens, preventing infection. Other basic defense mechanisms include low stomach pH, blood proteins, and the process of urination.
At the cellular level, tightly joined cells prevent invaders from crossing to deeper tissues. For example, endothelial cells that line blood vessels have tight cell-to-cell junctions that block pathogens from entering the bloodstream.
Lastly, the body has significant external physical barriers, like the protein keratin and hair in body openings, which physically trap pathogens and stop their movement deeper into the body.
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A. The least healthy types of fats are monounsaturated and polyunsaturated fats.
B. Almost all foods, including carrots and lettuce, have some fat.
C. Fats are able to completely dissolve in water or blood.
D. Excessive amounts of fat in the form of triglycerides help to reduce cholesterol.
Answer:
B. Almost all foods, including carrots and lettuce, have some fat.
Explanation:
Answer:
Just as chromosomal abnormalities cause the majority of miscarriages, certain chromosomal problems and birth defects can increase the risk that a baby will be stillborn. ... Chromosomal abnormalities are usually determined at conception, but birth defects can be caused by environmental influences during pregnancy.
Explanation:
A restrictive lung flow volume loop is characterized by a decreased forced vital capacity (FVC) and a prolonged time to exhale most of the air. Examples of restrictive lung diseases are respiratory distress syndrome and pulmonary fibrosis. The ratio of forced expiratory volume in one second (FEV1) to FVC can be used to diagnose restrictive or obstructive lung diseases.
A restrictive lung flow volume loop is characterized by a decreased forced vital capacity (FVC) and a prolonged time to exhale most of the air. In restrictive lung diseases, such as respiratory distress syndrome and pulmonary fibrosis, the lung tissue becomes less compliant and stiff, causing the airways to collapse upon exhalation. This leads to a reduced ability to exhale the normal amount of air and traps air in the lungs.
The ratio of forced expiratory volume in one second (FEV1) to FVC can be used to diagnose restrictive or obstructive lung diseases. In restrictive lung diseases, the FEV1/FVC ratio is typically within the normal range (around 88 to 90 percent), while obstructive lung diseases have a lower FEV1/FVC ratio (less than 69 percent).
Examples of restrictive lung diseases include respiratory distress syndrome and pulmonary fibrosis. These diseases result in reduced lung compliance, collapsible airways, and decreased ability to exhale air.
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