Unit 1: Body Organization and Homeostasis
-
Upload
olga-sharpe -
Category
Documents
-
view
46 -
download
1
description
Transcript of Unit 1: Body Organization and Homeostasis
Hippocrates
Greek physician born in 460 BC “Hippocratic Oath” Today Hippocrates is known as the "Father
of Medicine"
Human Body Orientation
Anatomical position Superior vs. Inferior Medial vs. Lateral Distal vs. Proximal Deep vs. Superficial Ipsilateral vs.
ContralateralFig. 1.20
Homeostasis
The body’s ability to maintain a stable internal environment– examples: human
body temperature, water balance, salt/ion balance, oxygen/CO2 balance, blood pH, etc
Fig 1.7
Gross vs. Fine Anatomy
Gross anatomy
Fine anatomy– involves cells and
tissues – Histology = study of
tissues
Histology & Pathology
Histology: The study of tissues
that compose the body
Pathology: the study of disease
Tissues
Cells organize into tissues– Tissue = Cells + extracellular matrix (EM)
Nonliving Made by the cells Fig. 5.24
4 Main Tissue Types
1. Epithelial tissue • Protective covering• One “free” side• Other side: basement membrane• Tightly packed, little EM• Classified according to shape and # of layer of cells
Fig. 5.6
4 Main Tissue Types
Epithelial cell # of layers:– Simple – one layer– Stratified – two or more layers
Epithelial cell shape:– Squamous - flat– Cuboidal – cube – Columnar – tall, elongated
What would simple cuboidal epithelial What would simple cuboidal epithelial
tissue look like?tissue look like?
Fig. 5.4
4 Main Tissue Types
2. Connective Tissue– Lots of EM– Binds structures, provides support and protection,
fills spaces, stores fat, produces blood cells, and protects against infections
Figs 5.21 & 5.24
4 Main Tissue Types
Types of Connective Tissue:– Loose CT– under most layers of epithelium– Adipose – stores fat– Dense CT – very strong but stretchy; tendons &
ligaments– Bone– Blood– Cartilage
Hyaline Elastic Fibrocartilage Figs 5.26 & 5.27
4 Main Tissue Types
Figs 5.28, 29, and 30
3. Muscle Tissue– Skeletal muscle
– Cardiac muscle
– Smooth muscle
4 Main Tissue Types
4. Nervous tissue– Communication– Example cells include neurons (nerve cells)
Fig. 5.31
Major Chemical Elements in the Body
65% Oxygen (O2) 18.5% Carbon (C ) 9.5% Hydrogen (H) 3.2% Nitrogen (N) Total O,C,H, & N =
approx 96% of the body by weight
Organic substances contain both C & H
The rest are inorganic substances
– electrolytes = inorganic substances that dissolve in water
Electrolytes
Electrolyte: any substance containing free ions that make the substance electrically conductive
Examples: Na+, Cl-, Ca2+, K+, Why are they important?
Trace Elements
A trace element – needed in very small ( i.e. “trace”…) amounts – crucial to human survival
Examples – iron (Fe) - part of hemoglobin molecule– zinc (Zn) – in several enzymes– copper (Cu) – bone and melanin development– iodine (I ) – synthesis of thyroid hormones