Inside the intestine the chyme keeps being processed by numerous enzymes and other substances, that will eventually break it down into chyle. The bolus keeps being pushed towards the intestines thanks to a series of contraction and relaxation of the digestive apparatus’ muscles: a process called peristalsis. Both the saliva and the gastric acid (also called gastric juice) contain several enzymes that start another process called chemical digestion, which allows our body to split everything we eat into small absorbable molecules. After this mass (the bolus) is propelled forward by the esophagus’ muscles, it is then acidified and further pressed by the stomach until it turns into a liquid paste called chyme. The first one is called mechanical digestion and starts in the mouth where food is chewed, tore and ground into small pieces, and then mixed up with saliva. And the carbon dioxide and water are expelled from your body.A delicious pizza – Photo by: Michael Stern From solid food, to simple molecules: the first steps of mechanical digestionĪfter we chew and swallow the food we are eating, everything ends up in our digestive system that is composed of several organs whose role is to turn the food we eat into nutrients by following several steps. Carbon dioxide and water are produced as waste products.In the cell, ATP helps power metabolic processes, fueling all of the activities of your life. ![]() Here, all the oxygen that you consume helps convert the energy to the molecule adenosine triphosphate, or ATP. When the glucose molecules first reach your cells, several enzymes initiate the breaking of bonds.This action liberates the energy that was holding the glucose molecules together! That energy is captured by other molecules in the mitochondria. Once glucose is digested and transported to your cells, a process called cellular respiration releases the stored energy and converts it to energy that your cells can use.Cellular respiration consists of three metabolic processes: glycolysis, the Krebs cycle, and oxidative phosphorylation. Your busy, active life takes a lot of energy! Where does that energy come from? It comes from the glucose in foods that you eat!Energy is stored in the chemical bonds of the glucose molecules. SpaceNext50 Britannica presents SpaceNext50, From the race to the Moon to space stewardship, we explore a wide range of subjects that feed our curiosity about space!.Learn about the major environmental problems facing our planet and what can be done about them! ![]() ![]() Saving Earth Britannica Presents Earth’s To-Do List for the 21st Century.Britannica Beyond We’ve created a new place where questions are at the center of learning.100 Women Britannica celebrates the centennial of the Nineteenth Amendment, highlighting suffragists and history-making politicians.COVID-19 Portal While this global health crisis continues to evolve, it can be useful to look to past pandemics to better understand how to respond today.Student Portal Britannica is the ultimate student resource for key school subjects like history, government, literature, and more.Britannica Explains In these videos, Britannica explains a variety of topics and answers frequently asked questions.Demystified Videos In Demystified, Britannica has all the answers to your burning questions. ![]()
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