Class 11 Exam > Class 11 Videos > Digestion Process - Digestion & Absorption
Digestion Process - Digestion & Absorption Video Lecture - Class 11
FAQs on Digestion Process - Digestion & Absorption Video Lecture - Class 11
| 1. What is the digestion process? |  |
Ans. The digestion process is a series of physiological steps that break down food into smaller molecules for absorption into the bloodstream. It involves the mechanical and chemical breakdown of food in the mouth, esophagus, stomach, small intestine, and large intestine.
| 2. How does the digestion process work? | |
Ans. The digestion process starts in the mouth, where food is chewed and mixed with saliva. It then travels down the esophagus into the stomach, where it is further broken down by stomach acid and enzymes. The partially digested food then moves into the small intestine, where it is broken down into even smaller molecules by enzymes from the pancreas and liver. Finally, the nutrients are absorbed into the bloodstream through the walls of the small intestine, while the remaining waste passes into the large intestine for elimination.
| 3. What are the main organs involved in the digestion process? | |
Ans. The main organs involved in the digestion process are the mouth, esophagus, stomach, small intestine, and large intestine. Additionally, the pancreas, liver, and gallbladder play essential roles by producing and releasing enzymes and substances that aid in digestion.
| 4. How long does the digestion process take? | |
Ans. The duration of the digestion process can vary depending on the individual and the type of food consumed. On average, it takes about 24 to 72 hours for food to pass through the entire digestive system. However, the actual time for digestion and absorption of nutrients can range from a few hours to several days.
| 5. What factors can affect the digestion process? | |
Ans. Several factors can affect the digestion process, including the type and quantity of food consumed, the person's overall health and digestive system function, stress levels, and the presence of any digestive disorders. Additionally, factors such as chewing thoroughly, eating slowly, and maintaining a balanced diet can contribute to proper digestion.
Text Transcript from Video
the primary functions of the digestive
system are the breakdown of food called
digestion and absorption of nutrients
digestion begins in the mouth where the
teeth break food into smaller particles
during mastication salivary glands
located near the oral cavity secrete
saliva which begins chemical digestion
and keeps the food moist as food is
swallowed the soft palate blocks the
upper pharynx to prevent food from
entering the nasal cavity and multiple
voluntary muscles in the face neck and
tongue contract pushing food particles
through the pharynx the food passes over
the epiglottis which prevents food entry
into the respiratory system and then
into the esophagus which connects the
pharynx to the stomach the one-way
movement of the food mass now called a
bolus is controlled by wave-like
involuntary muscle contractions this
movement is known as peristalsis
the bolus now enters the stomach folds
in the stomach wall called rugae allow
for expansion as the stomach fills
stomach cells secrete hydrochloric acid
pepsinogen and various regulatory
hormones that chemically digest the
bolus muscular contractions in the
stomach churn its contents to further
breakdown the bolus and mix it with
stomach secretions to form a thick
liquid called time time exits the
stomach through the pyloric sphincter
and enters the small intestine the major
site of nutrient absorption the small
intestine consists of three parts the
duodenum jejunum and ileum bile from the
liver and digestive enzymes from the
pancreas emptying into the duodenum to
aid in digestion absorb nutrients pass
from the lumen of the small intestine
into blood and lymph chyme not absorbed
in the small intestine enters the large
intestine as it passes through the cecum
and ascending transverse descending and
sigmoid colon water insults are absorbed
and time is converted into feces the
rectum store species until nervous
stimulation initiates the defecation
reflex resulting in elimination through
the anal canal
system are the breakdown of food called
digestion and absorption of nutrients
digestion begins in the mouth where the
teeth break food into smaller particles
during mastication salivary glands
located near the oral cavity secrete
saliva which begins chemical digestion
and keeps the food moist as food is
swallowed the soft palate blocks the
upper pharynx to prevent food from
entering the nasal cavity and multiple
voluntary muscles in the face neck and
tongue contract pushing food particles
through the pharynx the food passes over
the epiglottis which prevents food entry
into the respiratory system and then
into the esophagus which connects the
pharynx to the stomach the one-way
movement of the food mass now called a
bolus is controlled by wave-like
involuntary muscle contractions this
movement is known as peristalsis
the bolus now enters the stomach folds
in the stomach wall called rugae allow
for expansion as the stomach fills
stomach cells secrete hydrochloric acid
pepsinogen and various regulatory
hormones that chemically digest the
bolus muscular contractions in the
stomach churn its contents to further
breakdown the bolus and mix it with
stomach secretions to form a thick
liquid called time time exits the
stomach through the pyloric sphincter
and enters the small intestine the major
site of nutrient absorption the small
intestine consists of three parts the
duodenum jejunum and ileum bile from the
liver and digestive enzymes from the
pancreas emptying into the duodenum to
aid in digestion absorb nutrients pass
from the lumen of the small intestine
into blood and lymph chyme not absorbed
in the small intestine enters the large
intestine as it passes through the cecum
and ascending transverse descending and
sigmoid colon water insults are absorbed
and time is converted into feces the
rectum store species until nervous
stimulation initiates the defecation
reflex resulting in elimination through
the anal canal
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Nov 14, 2024 Last updated |
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