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The Respiratory System - PowerPoint PPT Presentation


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The Respiratory System. Airflow Into The Body: 2 Passageways. External Nares Nasal Cavity Nasopharynx Trachea Primary Bronchi Lobar Bronchi Bronchioles Alveoli (air sacs). Mouth Opening Oral Cavity Oropharynx Trachea Primary Bronchi Lobar Bronchi Bronchioles Alveoli (air sacs).

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slide2

Airflow Into The Body: 2 Passageways

External Nares

Nasal Cavity

Nasopharynx

Trachea

Primary Bronchi

Lobar Bronchi

Bronchioles

Alveoli (air sacs)

Mouth Opening

Oral Cavity

Oropharynx

Trachea

Primary Bronchi

Lobar Bronchi

Bronchioles

Alveoli (air sacs)

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larynx - voice box, supported by thyroid cartilage(adam's apple) + cricoid cartilage

epiglottis - tongue-like structure that closes off larynx when we swallow

trachea - "windpipe", supported by thoracic rings

thoracic rings - "c" shaped cartilagenous rings, not completely circular to allow esophagus (located behind trachea) to expand when we swallow food, but enough stability to maintain an open passageway of the trachea regardless of pressure change during breathing

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The Digestive System

Function: To mechanically + chemically process the foods we eat by breaking down food, absorbing the nutrients contained therein, + eliminating undigested food as waste

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Two primary sections:

Digestive tract, alimentary canal or gastrointestinal (GI) tract - a muscular tube that extends from the mouth to the anus (~30ft long)

Accessory organs - manufacture, store, or secrete fluids that contain water, enzymes, buffers, and other components that assist in preparing nutrients for absorption

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Digestive Tract:

oral cavity

oropharynx

esophogus

stomach 

small intestines

large intestines

rectum

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Accessory Organs

salivary glands - produce saliva, which contains digestive enzymes that begin the chemical breakdown of food

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Pancreas -contains exocrine cells that secrete buffers +digestive enzymes (also makes insulin)

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Liver - secretesbile (required for digestion of fats), stores nutrients and vitamins, and has many metabolic and regulatory functions

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Gall bladder - stores and concentrates bile received from the liver until needed in the small intestines (helps digest fat).