@SmartDoctor1
=================
The human digestive system consists of the gastrointestinal tract plus the accessory organs of digestion (the tongue, salivary glands, pancreas, liver, and gallbladder). Digestion involves the breakdown of food into smaller and smaller components, until they can be absorbed and assimilated into the body. The process of digestion has three stages: the cephalic phase, the gastric phase, and the intestinal phase.
The first stage, the cephalic phase of digestion, begins with secretions from gastric glands in response to the sight and smell of food. This stage includes the mechanical breakdown of food by chewing, and the chemical breakdown by digestive enzymes, that takes place in the mouth. Saliva contains the digestive enzymes amylase, and lingual lipase, secreted by the salivary and serous glands on the tongue. Chewing, in which the food is mixed with saliva, begins the mechanical process of digestion. This produces a bolus which is swallowed down the esophagus to enter the stomach.
The second stage of digestion begins in the stomach with the gastric phase. Here the food is further broken down by mixing with gastric acid until it passes into the duodenum, the first part of the small intestine.
The third stage begins in the duodenum with the intestinal phase, where partially digested food is mixed with a number of enzymes produced by the pancreas. Digestion is helped by the chewing of food carried out by the muscles of mastication, the tongue, and the teeth, and also by the contractions of peristalsis, and segmentation. Gastric acid, and the production of mucus in the stomach, are essential for the continuation of digestion.
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 (feces) are defecated from the rectum via the anus.
The heart is a muscular organ in most animals. This organ pumps blood through the blood vessels of the circulatory system.[1] The pumped blood carries oxygen and nutrients to the body, while carrying metabolic waste such as carbon dioxide to the lungs. In humans, the heart is approximately the size of a closed fist and is located between the lungs, in the middle compartment of the chest.
In humans, other mammals, and birds, the heart is divided into four chambers: upper left and right atria and lower left and right ventricles. Commonly the right atrium and ventricle are referred together as the right heart and their left counterparts as the left heart.[6] Fish, in contrast, have two chambers, an atrium and a ventricle, while most reptiles have three chambers. In a healthy heart blood flows one way through the heart due to heart valves, which prevent backflow. The heart is enclosed in a protective sac, the pericardium, which also contains a small amount of fluid. The wall of the heart is made up of three layers: epicardium, myocardium, and endocardium.
=================
Follow us on the @SmartDoctor1 digital platform
=================
▶ TikTok ▶ @
▶ Facebook ▶
▶ Instagram ▶
▶ twitter ▶
=============
Smart Doctor 👨⚕️
@SmartDoctor1/youtube
=============
#digestivesystem #system #digestive #intestine
#mouth #esophagus #stomach #smallintestine
#largeintestine #pancreas #liver #gallbladdercancer
=============
#anatomy #heart
#ecg #electrocardiograma
#smoker #lunges #lungs
#uterusproblem
#fetal #love
#tongue #muscles #muscle
#skull #humanskull
#fetaldevelopment #fetal #fetalmovement
#fetalecho #heart #baby
#brain #shorts #viral
#the_voice #thevoice #voice #voiceover
#SmartDoctor1
#smartdoctor
#Smart_Doctor
#brain #shorts #viral #baby
#the_voice #thevoice #voice #voiceover
#oxygen #blood #body
#pregnancy #medicina #anatomy #doctor #america #माहवारी #月経 #임신 #妊娠 #pregnant #gravidez #information #pronunciation #speak #speech #read
1 view
652
177
10 years ago 00:06:22 143
Love Your Total Body Workout | Tone It Up Love Your Body Series
10 years ago 00:07:17 238
Love Your Legs Routine With Karena! | Tone It Up Love Your Body Series
10 years ago 00:07:16 304
Love Your Abs Routine With Katrina! | Tone It Up Love Your Body Series
10 years ago 00:06:24 863
Love Your Arms Routine With Karena! | Tone It Up Love Your Body Series
3 years ago 00:14:18 13
Light in your ocean — lovely lofi music
10 years ago 00:10:33 206
Love Your Booty Routine With Katrina! | Tone It Up Love Your Body Series
9 years ago 00:03:16 6.6K
Record Dance Video / Tiësto & DallasK - Your Love
5 years ago 00:02:58 42
YOUR LOVELY MAX & KSUSHA BREAK - 2 БИЛЕТА
11 years ago 00:03:41 67
Live your Love , Love your Life
5 years ago 00:01:37 183
stern: Love your voice
11 years ago 00:03:30 28
HAPPY BIRTHDAY ADAM!!!! (from your lovely Russian Glamberts)
9 years ago 00:03:23 16
Lord Jesus, Your Lovely
13 years ago 00:03:45 49
AlunaGeorge - Your Drums, Your Love
4 years ago 00:03:28 17
Redbone - Come and Get Your Love (Single Edit - Audio)
10 years ago 00:48:06 57
Heroin and Your Veins - Lovely Bone Structure
12 years ago 00:00:57 27
Make A Lovely Mag Bag Out Of Your Tank Top
13 years ago 00:02:51 171
Радио ENERGY | REDLIGHT - Lost In Your Love
1 year ago 00:02:10 155
Sol & Sun Jae - Keep your eyes on me [Lovely runner +1x14]
8 years ago 00:03:44 1.4K
Record Dance Video / Sylver - Turn Your Love Around
2 years ago 00:02:37 105
Your Love
6 years ago 00:10:51 14
Karen Lovely - Ask Your Heart
9 years ago 00:03:49 19.6K
Sigala - Give Me Your Love (Official Video) ft. John Newman, Nile Rodgers
12 years ago 00:03:48 1.6K
Calvin Harris - I Need Your Love ft. Ellie Goulding