Comprehensive Study Notes for Anatomy & Physiology: Key Concepts and Systems

Ch 4 - Histology

Tissue Types

The body is composed of four basic tissue types: epithelial, connective, muscle, and nervous tissue.

• Epithelial: Covers surfaces, lines cavities.

• Connective: Supports, binds, and protects organs.

• Muscle: Produces movement.

• Nervous: Transmits signals.

Basal Lamina

The basal lamina is a layer of extracellular matrix that supports epithelial cells.

• Function: Provides structural support and filtration.

Vascularity and Healing

Tissues vary in their blood supply, affecting their ability to heal.

• Highly Vascular: Connective tissue (e.g., bone).

• Poorly Vascular: Cartilage, epithelial tissue.

Specialized Structures

• Cilia: Move substances over cell surfaces.

• Microvilli: Increase surface area for absorption.

• Goblet Cells: Secrete mucus.

Gland Types

Glands are classified as endocrine (secrete into blood) or exocrine (secrete into ducts).

• Endocrine: Hormones.

• Exocrine: Sweat, saliva.

Gland Structure	Example
Tubular	Intestinal glands
Alveolar	Salivary glands
Compound	Mammary glands
Simple	Sweat glands

Ch 5 - Integumentary System

Skin Structure and Function

The skin is the largest organ, providing protection, sensation, and regulation.

• Layers: Epidermis (outer), dermis (middle), hypodermis (inner).

• Functions: Protection, temperature regulation, sensation.

Melanin

Melanin is a pigment produced by melanocytes in the epidermis, responsible for skin color and protection from UV radiation.

Skin Receptors

• Pacinian Corpuscle: Detects pressure.

• Merkel Cells: Detect touch.

Burns and Skin Damage

Burns are classified by depth and percentage of skin affected.

• Rule of 9: Used to estimate burn area.

Ch 6 - Bone

Bone Formation and Growth

Bones develop through intramembranous and endochondral ossification.

• Intramembranous: Direct formation from mesenchyme (e.g., skull).

• Endochondral: Replacement of cartilage by bone (e.g., long bones).

Bone Composition

• Organic: Collagen fibers.

• Inorganic: Hydroxyapatite (calcium phosphate).

Bone Growth Regulation

• Hormones: Growth hormone, thyroid hormone, sex hormones.

• Nutrients: Calcium, vitamin D.

Bone Classification

• Axial Skeleton: Skull, vertebral column, rib cage.

• Appendicular Skeleton: Limbs, girdles.

Fractures

• Types: Simple, compound, comminuted, greenstick.