Physiology And Homeostatsis

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1.1 Intro to Physiology
Physiology: the study of the functions of living things, how the human body works
Two approaches explain the events that occur in body -purpose of the body process - mechanism in which the process occurs
Physiologists view the body as a machine whose mechanisms of action can explained in terms of cause and effect sequences of physical and chemical processes.
Physiology is closely related to anatomy: the study of the structure of the body.
The nutrient –absorbing intestinal cells have a multitude of fingerlike projections in contact with the digested food. Based on knowledge of structure –function relationships, explain the functional advantage
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Exocrine Glands: secrete through ducts to the outside of the body. Endocrine Glands: lack ducts and release their secretory products known as hormones internally into the blood.
-Connective Tissue: few cells dispersed within an abundance of extracellular material, connects, supports, and anchors various body parts. Cells produce specific structural molecules that they release into the extracellular spaces between the cells.

Organ Level
Organs: two or more types of primary tissue organized to perform a particular function or functions, each layer of tissue has its on job in the function
EX. Stomach, smooth: contracts to mix foods, epithelial: secrete digestive enzymes nervous: controls contraction and secretion, connective: holds it all together.

Body System Level
Body systems: Collection of related organs, how groups of organs are organized. Each system is a collection of organs that perform related functions and interact for a common activity essential for survival of the body.
The body has 11 systems:
Circulatory: heart blood vessels, blood
Digestive: mouth pharynx, esophogas, stomach, intestine, salivary glands, pancreas, liver, gallbladder Respiratory: nose pharynx, larynx, trachea, bronchi, lungs Urinary: kidneys, ureters, urinary bladder, urethra Skeletal: bones, cartilage, joints Muscular: skeletal muscles Integumentary: skin, hair, nails
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