To The first One ONLY!
The human digestive system consists of the gastrointestinal tract plus the accessory organs of digestion (the tongue, salivary glands, pancreas, liver, and gallbladder).[1] In this system, the process of digestion has many stages, the first of which starts in the mouth. Digestion involves the breakdown of food into smaller and smaller components, until they can be absorbed and assimilated into the body.
Chewing, in which food is mixed with saliva begins the process of digestion. This produces a bolus which can be swallowed down the esophagus and into the stomach. Here it is mixed with gastric juice until it passes into the duodenum, where it is mixed with a number of enzymes produced by the pancreas. Saliva also contains a catalyticenzyme called amylase which starts to act on food in the mouth. Another digestive enzyme called lingual lipase is secreted by some of the lingual papillae on the tongue and also from serous glands in the main salivary glands. Digestion is helped by the mastication of food by the teeth and also by the muscular actions of peristalsis and segmentation contractions. Gastric juice in the stomach is essential for the continuation of digestion as is the production of mucus in the stomach.
Peristalsis is the rhythmic contraction of muscles that begins in the esophagus and continues along the wall of the stomach and the rest of the gastrointestinal tract. This initially results in the production of chyme which when fully broken down in the small intestine is absorbed as chyle into the lymphatic system. Most of the digestion of food takes place in the small intestine. Water and some minerals are reabsorbed back into the blood in the colon of the large intestine. The waste products of digestion (faeces) are defecated from the anus via the <span>rectum</span>
Answer:
Jonas Salk was awarded the Nobel Prize for discovering a way to vaccinate against polio in the United States in the 1950's. This allowed millions of school-age children to avoid crippling disease, and to swim during summer again, as polio was often spread in public swimming areas before.
The statement that best describes how the polio vaccine works is:
It triggers the immune system to produce antobodies to fight the disease-causing agent.
Explanation:
There are two main reasons for this answer. The first one is that every vaccine is aimed to introduce a controlled amount of antigenes to be accepted by the organism. These antigens are made after some studies were conducted in a lab and were obtained from substances that the human body can accept to train the immune system to develop an effective defense for the virus or bacteria on the matter. In our case, the polio vaccine works the same way and allowed to save many lives.
Answer:
20.8
Explanation:
I took it and it was right
Explanation:
Oceans in hot, dry climates experience a high rate of evaporation compared to oceans in cooler climates. In addition, due to little precipitation, these oceans to not fully refill their waters. When the water evaporates, the ocean waters experience a slight reduction in volume. The salts in the oceans, nonetheless, remain the same (quantity). This means that the water that is left behind becomes more concentrated because it dissolves the same amount of salts left in the oceans. Remember concentration, in this case, is the number of salts dissolved per volume of ocean water which translates to high salinity.
However, the more saline the ocean waters, become more energy from the sun is required to evaporate the remaining water. Remember impurities increase the boiling point of a solution.
Learn More:
For more on concentration check out;
brainly.com/question/9953627
brainly.com/question/5170384
#LearnWithBrainly
Answer:
chloroplast
Explanation:
light and oxygen are a crucial thing for plants
