Foundational Study Guide: Introduction to Anatomy & Physiology and Basic Chemistry

Introduction to Anatomy & Physiology

Overview of Anatomy & Physiology

Anatomy and Physiology (A&P) are foundational sciences for understanding the structure and function of the human body. Anatomy focuses on the physical structures, while physiology explores how those structures work together to sustain life.

• Anatomy: The study of the structure of body parts and their relationships to one another.

• Physiology: The study of the function of body parts and how they work to carry out life-sustaining activities.

• Example: The heart's anatomy includes chambers and valves; its physiology involves pumping blood throughout the body.

Levels of Organization

The human body is organized into hierarchical levels, each building upon the previous to form a functional organism.

• Chemical Level: Atoms and molecules essential for life.

• Cellular Level: Cells are the basic units of life.

• Tissue Level: Groups of similar cells performing a common function.

• Organ Level: Structures composed of two or more tissue types.

• Organ System Level: Groups of organs working together.

• Organism Level: The complete living being.

Homeostasis

Homeostasis is the body's ability to maintain a stable internal environment despite changes in external conditions.

• Definition: The maintenance of relatively stable internal conditions.

• Importance: Essential for survival and proper function.

• Example: Regulation of body temperature, blood glucose levels.

Homeostatic Mechanisms

• Negative Feedback: Reduces the effect of the original stimulus (e.g., body temperature regulation).

• Positive Feedback: Enhances the original stimulus (e.g., blood clotting).

• Components: Receptor, control center, effector.

Body Cavities and Membranes

The body contains several cavities that house organs and are lined by membranes.

• Major Cavities: Dorsal (cranial and vertebral), ventral (thoracic and abdominopelvic).

• Serous Membranes: Thin membranes lining body cavities and covering organs.

• Visceral Layer: Covers organs.

• Parietal Layer: Lines cavity walls.

Anatomical Terminology

Precise terminology is used to describe locations and directions in the body.

• Directional Terms: Superior, inferior, anterior, posterior, medial, lateral, bilateral, ipsilateral, contralateral, proximal, distal, superficial, deep.

• Body Regions: Cephalic, frontal, nasal, oral, buccal, mental, acromial, axillary, cervical, brachial, antebrachial, carpal, mammary, pectoral, patellar, tarsal, occipital, vertebral, lumbar, sacral, gluteal, popliteal.

• Quadrants: Right upper, left upper, right lower, left lower.

Body Planes and Sections

• Sagittal Section: Divides the body into right and left parts.

• Transverse (Horizontal) Section: Divides the body into superior and inferior parts.

• Coronal (Frontal) Section: Divides the body into anterior and posterior parts.

• Other Sections: Cross, oblique, longitudinal.

Basic Chemistry for Anatomy & Physiology

Atoms, Elements, and Molecules

Chemistry is essential for understanding the composition and function of the human body.

• Atom: The smallest unit of matter retaining the properties of an element.

• Element: A pure substance consisting of one type of atom.

• Molecule: Two or more atoms bonded together.

• Compound: A molecule containing atoms of different elements.

Atomic Structure

• Protons: Positively charged particles in the nucleus.

• Neutrons: Neutral particles in the nucleus.

• Electrons: Negatively charged particles orbiting the nucleus.

• Electron Shells: Energy levels where electrons reside; the first shell holds up to 2 electrons, the second up to 8, etc.

Chemical Bonds

• Ionic Bond: Transfer of electrons between atoms.

• Covalent Bond: Sharing of electrons between atoms.

• Hydrogen Bond: Weak attraction between a hydrogen atom and another electronegative atom.

Types of Chemical Reactions

• Synthesis: $A + B \rightarrow AB$

• Decomposition: $AB \rightarrow A + B$

• Exchange: $AB + CD \rightarrow AC + BD$

• Reversible: $A + B \rightleftharpoons AB$

Acids, Bases, and pH

• Acid: Releases hydrogen ions ($H^+$) in solution.

• Base: Releases hydroxide ions ($OH^-$) or accepts $H^+$.

• pH Scale: Measures hydrogen ion concentration; ranges from 0 (acidic) to 14 (basic), with 7 as neutral.

• Normal Blood pH: $7.35 - 7.45$

Organic and Inorganic Compounds

• Organic Compounds: Contain carbon and hydrogen; include carbohydrates, lipids, proteins, nucleic acids.

• Inorganic Compounds: Do not contain both carbon and hydrogen; include water, salts, acids, bases.

• Main Groups of Organic Compounds: Carbohydrates, lipids, proteins, nucleic acids.

Carbohydrates

• Function: Provide energy for cellular processes.

• Monosaccharides: Simple sugars (e.g., glucose).

• Disaccharides: Two monosaccharides joined (e.g., sucrose).

• Polysaccharides: Long chains of monosaccharides (e.g., glycogen).

Lipids

• Function: Energy storage, insulation, cell membrane structure.

• Main Groups: Triglycerides, phospholipids, steroids.

• Solubility: Lipids are generally insoluble in water.

• Difference between Glucose and Glycogen: Glucose is a monosaccharide; glycogen is a polysaccharide used for energy storage.

Proteins

• Function: Structural support, enzymes, transport, defense.

• Structure: Built from amino acids linked by peptide bonds.

• Levels of Structure: Primary, secondary, tertiary, quaternary.

Nucleic Acids

• Function: Store and transmit genetic information.

• Types: DNA (deoxyribonucleic acid), RNA (ribonucleic acid).

• Nucleotide: Building block of nucleic acids; consists of a sugar, phosphate group, and nitrogenous base.

• DNA: Double helix; sugar is deoxyribose.

• RNA: Single strand; sugar is ribose.

HTML Table: Directional Terms and Body Regions

Directional Term	Definition
Superior	Above; toward the head
Inferior	Below; away from the head
Anterior	Front; toward the front of the body
Posterior	Back; toward the back of the body
Medial	Toward the midline
Lateral	Away from the midline
Bilateral	On both sides
Ipsilateral	On the same side
Contralateral	On the opposite side
Proximal	Closer to the point of attachment
Distal	Farther from the point of attachment
Superficial	Toward the surface
Deep	Away from the surface

Body Region	Location
Cephalic	Head
Frontal	Forehead
Nasal	Nose
Oral	Mouth
Buccal	Cheek
Mental	Chin
Acromial	Shoulder
Axillary	Armpit
Cervical	Neck
Brachial	Arm
Antebrachial	Forearm
Carpal	Wrist
Mammary	Breast
Pectoral	Chest
Patellar	Kneecap
Tarsal	Ankle
Occipital	Back of head
Vertebral	Spinal column
Lumbar	Lower back
Sacral	Base of spine
Gluteal	Buttock
Popliteal	Back of knee

Additional info: These study notes expand upon the original question list by providing definitions, examples, and context for each major topic, ensuring a self-contained and comprehensive review for exam preparation.