Foods and Nutrition 1021 Lecture Notes - Lecture 3: Lymphatic Vessel, Extracellular Fluid, Circulatory System
29 Aug 2016
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Document Summary
The human body is made of trillions of cells, none of which know anything about food. Each cell is a self-contained, living entity, but it depends on the rest of the body"s cells to supply its needs. Cells need energy, oxygen, and nutrients, including water, to remain healthy and do their work. Genes direct the making of each cell"s machinery, including enzymes. Genes and nutrients interact in ways that affect health. Enzyme: a working protein that speeds up a specific chemical reaction. Fat cells: specialize in the storage of fat and form fat tissue, produce enzymes that metabolize fat and hormones involved in appetite and energy balance. Specialized cells are grouped to form tissues and organs; organs work together in body systems. Tissues: systems of cells working together to perform tasks (muscles, nerves, blood, bone). Organs: structural units made of tissues that perform certain jobs (heart, liver, brain).
