Nutrition for Fitness Leaders

Background

Tracey Kobayashi

50 Phelan Ave, NGYM
San Francisco, CA 94112
(415)452-7311
tkobayas@ccsf.edu

Tracey's Home

    PE 9A: Fit or Fat
    College & Career Ed
    PE 50: Fitness Center

CCSF Home

PE Department

SFHA Computer Class

Lectures

Old Courses

IM Me!

    AIM - TKatCCSF
    Yahoo - tkobico
    ICQ - 155909399

[ Intro ] [ Nutrients ] [ Energy ]
[ Apps ] [ Commercial Diets ]

Gastrointestinal Function

Provides nutrients to the body via digestion and absorption.

• Digestion: break down of food into their base constituents via mechanical or chemical means.
  • Mechanical
    mastication; muscular contractions which mix, chop and move the food along the tract.
  • Chemical
    secretions from cells in the walls of the GI tract and the pancreas react with food constituents to break them down into their base nutrients.
• Absorption: transport of nutrients from the GI tract into the circulation. Most nutrient absorption occurs in the small intestine. Water and electrolyte reabsorption occur in the large intestine.

Works by progressively breaking down food into smaller pieces and giving it a more liquid consistency as it propels it through each segment until nutrients are absorbed, at which point water and electrolytes are removed before elimination.

Control of the GI Tract

Enteric Nervous System: excites or inhibits GI functions. Enteric system is influenced by sympathetic and parasympathetic systems.

• Parasympathetic (from eating, anticipation): Stimulates enteric activity.
• Sympathetic: norepineprhine inhibits enteric neurons and smooth muscle contraction.

[ Intro ] [ Nutrients ] [ Energy ]
[ Apps ] [ Commercial Diets ]