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Anatomy & Physiology Exam 1 Study Guide: Human Body Orientation, Chemistry, and Cells

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Chapter 1: The Human Body: An Orientation

Anatomical Position

The anatomical position is a standard reference posture used in anatomy to describe locations and relationships of body parts. The body stands upright, facing forward, with arms at the sides and palms facing forward.

  • Importance: Provides a consistent frame of reference for anatomical terminology.

  • Example: The thumb is lateral to the little finger in anatomical position.

Organ Systems Overview

The human body consists of eleven major organ systems, each with specific functions essential for survival.

  • Key Systems: Integumentary, skeletal, muscular, nervous, endocrine, cardiovascular, lymphatic, respiratory, digestive, urinary, reproductive.

  • Example: The respiratory system is responsible for gas exchange.

Homeostasis

Homeostasis is the maintenance of a stable internal environment despite changes in external conditions.

  • Mechanisms: Negative feedback (most common), positive feedback (less common).

  • Example: Regulation of body temperature.

Directional and Regional Terms

Directional terms describe the locations of structures relative to other structures or locations in the body.

  • Examples: Superior, inferior, anterior, posterior, medial, lateral, proximal, distal.

  • Regional Terms: Axial (head, neck, trunk), appendicular (limbs).

Body Cavities and Regions

The body contains several cavities that house organs, and regions used for anatomical reference.

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

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

Levels of Structural Organization

Organization in the human body progresses from simple to complex.

  • Levels: Chemical, cellular, tissue, organ, organ system, organism.

Feedback Systems

  • Negative Feedback: Reduces the effect of the stimulus (e.g., blood glucose regulation).

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

Membranes

  • Types: Pericardium (heart), pleura (lungs), peritoneum (abdominal organs).

Chapter 2: Chemistry Comes Alive

Basic Chemistry Concepts

Chemistry is fundamental to understanding physiological processes in the body.

  • Atoms: Basic unit of matter, composed of protons, neutrons, electrons.

  • Elements: Substances made of one type of atom.

  • Major Elements in Body: Oxygen, carbon, hydrogen, nitrogen.

Forms of Energy

  • Types: Chemical, electrical, mechanical, radiant.

  • Example: ATP stores chemical energy for cellular processes.

Chemical Bonds

  • Ionic Bonds: Transfer of electrons.

  • Covalent Bonds: Sharing of electrons.

  • Hydrogen Bonds: Weak attractions between polar molecules.

Macromolecules

  • Carbohydrates: Monosaccharides, disaccharides, polysaccharides.

  • Lipids: Triglycerides, phospholipids, steroids.

  • Proteins: Amino acids, peptide bonds, four levels of structure.

  • Nucleic Acids: DNA, RNA.

Reactions

  • Dehydration Synthesis: Formation of larger molecules by removal of water.

  • Hydrolysis: Breakdown of molecules by addition of water.

pH and Buffers

  • pH Scale: Measures hydrogen ion concentration; ranges from 0 (acidic) to 14 (basic).

  • Buffers: Substances that minimize changes in pH.

  • Equation:

DNA and RNA

  • DNA: Double helix, complementary base pairing (A-T, C-G).

  • RNA: Single-stranded, involved in protein synthesis.

Types of Bonds in Biological Molecules

  • Peptide Bonds: Link amino acids in proteins.

  • Phosphodiester Bonds: Link nucleotides in nucleic acids.

Chapter 3: Cells: The Living Units

Cell Structure and Function

Cells are the basic units of life, with specialized structures for various functions.

  • Common Features: Plasma membrane, cytoplasm, organelles, nucleus.

  • Organelles: Mitochondria (energy), ribosomes (protein synthesis), endoplasmic reticulum (transport), Golgi apparatus (modification and packaging).

Plasma Membrane

  • Structure: Phospholipid bilayer with embedded proteins.

  • Function: Selective barrier, communication, transport.

  • Significance: Maintains homeostasis by regulating entry and exit of substances.

Membrane Transport

  • Types: Passive (diffusion, osmosis), active (pumps, vesicular transport).

  • Osmosis: Movement of water across a membrane.

  • Isotonic, Hypotonic, Hypertonic Solutions: Affect cell volume and water movement.

Cell Cycle

  • Phases: Interphase (G1, S, G2), mitosis (prophase, metaphase, anaphase, telophase), cytokinesis.

  • Importance: Growth, repair, reproduction.

Junctions and Intercellular Connections

  • Types: Tight junctions, desmosomes, gap junctions.

  • Function: Maintain tissue integrity, communication.

Genetic Code and Protein Synthesis

  • Central Dogma: DNA → RNA → Protein.

  • Transcription: DNA to RNA.

  • Translation: RNA to protein.

  • Codon: Sequence of three nucleotides in mRNA that codes for an amino acid.

Intracellular vs. Extracellular Fluid

  • Intracellular Fluid: Fluid within cells.

  • Extracellular Fluid: Fluid outside cells (includes interstitial fluid and plasma).

Additional info:

  • Review definitions and diagrams for all listed topics for comprehensive exam preparation.

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