Anatomy & Physiology: Foundational Concepts and Study Guide

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Introduction to Anatomy & Physiology

Definitions and Scope

Anatomy and physiology are foundational sciences in understanding the human body. Anatomy focuses on the structure of body parts, while physiology studies their functions.

Physiology: The study of how living organisms perform their vital functions.
Anatomy: The study of the structure and relationships among body parts.
Gross Anatomy: Study of structures visible to the naked eye.
Histology: Study of tissues at the microscopic level.

Levels of Organization

The human body is organized into hierarchical levels, each with increasing complexity.

Chemical level: Atoms and molecules
Cellular level: Cells and their organelles
Tissue level: Groups of similar cells
Organ level: Contains two or more types of tissues
Organ system level: Organs that work closely together
Organismal level: All organ systems combined to make the whole organism

Body Systems and Cavities

The body is divided into several organ systems, each with specific functions, and is organized into cavities that house these systems.

Major organ systems: Integumentary, skeletal, muscular, nervous, endocrine, cardiovascular, lymphatic, respiratory, digestive, urinary, reproductive.
Body cavities: Dorsal (cranial and vertebral), ventral (thoracic and abdominopelvic).

Membranes and Homeostasis

Membranes line body cavities and organs, while homeostasis maintains internal stability.

Membranes: Mucous, serous, cutaneous, synovial.
Homeostasis: The maintenance of a stable internal environment.
Feedback loops: Mechanisms that regulate homeostasis, including negative and positive feedback.

Example: Regulation of blood glucose by insulin (negative feedback).

Chemistry of Life

Basic Chemistry Concepts

Understanding the chemical basis of life is essential for studying physiology.

Atom: The smallest unit of matter.
Element: A substance made of one type of atom.
Molecule: Two or more atoms bonded together.
Major elements in the human body: Oxygen, carbon, hydrogen, nitrogen, calcium, phosphorus.

Bonds and Chemical Reactions

Covalent bond: Atoms share electrons.
Ionic bond: Transfer of electrons from one atom to another.
Polar molecule: Unequal sharing of electrons, resulting in partial charges (e.g., water).
Hydrophilic: Water-loving; dissolves in water.
Hydrophobic: Water-fearing; does not dissolve in water.

Example: NaCl is an ionic compound; water is a polar covalent molecule.

Macromolecules

Carbohydrates: Monosaccharides, disaccharides, polysaccharides. Main source of energy.
Lipids: Triglycerides, phospholipids, steroids. Important for cell membranes and energy storage.
Proteins: Made of amino acids. Functions include enzymes, structure, transport, signaling.
Nucleic acids: DNA and RNA. Store and transmit genetic information.

Table: Properties of Selected Molecules

Molecule	Hydrophilic or Hydrophobic	Covalent or Ionic	Polar or Nonpolar (if covalent)
LiBr	Hydrophilic	Ionic	—
NaF	Hydrophilic	Ionic	—
NH3	Hydrophilic	Covalent	Polar
CaCl2	Hydrophilic	Ionic	—
CH4	Hydrophobic	Covalent	Nonpolar

Cell Structure and Function

Cell Organelles

Cells contain specialized structures called organelles, each with unique functions.

Nucleus: Contains genetic material (DNA).
Mitochondria: Site of ATP (energy) production.
Ribosomes: Protein synthesis.
Endoplasmic reticulum (ER): Rough ER synthesizes proteins; smooth ER synthesizes lipids.
Golgi apparatus: Modifies, sorts, and packages proteins and lipids.
Lysosomes: Digestive enzymes for breakdown of waste.
Peroxisomes: Detoxify harmful substances.

Plasma Membrane Structure

The plasma membrane is a selectively permeable barrier composed mainly of a phospholipid bilayer with embedded proteins.

Phospholipid bilayer: Hydrophilic heads face outward; hydrophobic tails face inward.
Proteins: Serve as channels, receptors, enzymes, and transporters.
Carbohydrates: Attached to proteins and lipids; involved in cell recognition.

Transport Across Membranes

Channels: Allow specific ions or molecules to pass through the membrane.
Carriers: Bind and transport substances across the membrane.
Receptors: Bind signaling molecules and initiate cellular responses.

Energy and Chemical Reactions

Types of Energy

Potential energy: Stored energy.
Kinetic energy: Energy of motion.

Chemical Reactions in the Body

Reactants: Substances that enter a reaction.
Products: Substances produced by a reaction.
Activation energy: Energy required to start a reaction.
Enzymes: Biological catalysts that speed up reactions by lowering activation energy.

Example: Breakdown of glucose during cellular respiration.

Catabolic vs. Anabolic Reactions

Catabolic: Break down molecules, releasing energy (e.g., digestion).
Anabolic: Build complex molecules from simpler ones, requiring energy (e.g., protein synthesis).

Factors Affecting Reaction Rates

Concentration of reactants
Temperature
pH
Presence of enzymes
Substrate concentration

Tissues and Histology

Types of Tissues

Epithelial tissue: Covers surfaces, lines cavities, forms glands.
Connective tissue: Supports, protects, binds other tissues (e.g., bone, blood, cartilage).
Muscle tissue: Produces movement (skeletal, cardiac, smooth).
Nervous tissue: Transmits electrical impulses.

Structure-Function Relationships

Extracellular matrix (ECM): Network of proteins and carbohydrates outside cells, providing support and regulating behavior.
Examples: Collagen fibers in connective tissue provide strength; reticular fibers form supportive networks.

Membranes and Fibrosis

Serous membrane: Lines body cavities not open to the outside; produces serous fluid.
Mucous membrane: Lines cavities open to the outside; produces mucus.
Fibrosis: Formation of excess fibrous connective tissue, often as a reparative response to injury.

Sample Study Questions

Which body system functions are easy to confuse/sound similar? What distinguishes them?
Label a blank diagram of body cavities and list major organs in each.
Sketch and describe the steps of a negative feedback loop in your own words.
How does a positive feedback loop differ from a negative feedback loop?
What is the difference between an ionic and a covalent bond?
Show a hydrogen bond differ from polar covalent bonds?
What makes a nonpolar covalent molecule hydrophobic?
Fill in the table above for molecule properties.
What is the main role of carbohydrates in the body? In what form are carbohydrates stored?
Why are lipids nonpolar but carbohydrates polar? What makes phospholipids unique?
Why is a protein's structure important?
What is the genetic code? How can changes in DNA alter the structure and function of a cell?

Practice Exam Questions

If blood sugar gets too high, insulin is released from the pancreas. Insulin travels in the blood to the fat and muscle cells, and makes these cells move sugar (glucose) to the inside, which then lowers blood sugar. This is an example of:
- a. Positive feedback
- b. Negative feedback
KF is likely to have ___ bonds and be ___:
- a. Polar covalent, hydrophobic
- b. Ionic, hydrophilic
Which is correct about chemical reactions?
- a. Anabolic and catabolic reactions have similar activation energies
- b. Anabolic reactions release more energy than catabolic reactions
- c. Only catabolic reactions release heat, anabolic reactions do not
- d. Anabolic reactions form large molecules from smaller molecules
Which of the following is true about the plasma membrane?
- a. Nonpolar lipids do pass through it easily.
- b. It is made of phospholipids with nonpolar heads and polar fatty acid tails.
- c. Channel proteins allow nonpolar molecules such as water to pass through it.
- d. Carrier proteins require one type of molecule to bind and then open to allow passage of the molecule through.
What describes the structure of muscle tissues?
- a. Loosely packed cells
- b. A lot of ground substance is visible
- c. Protein fibers found in basement membrane
- d. ECM is called endomysium
Which organ system regulates body functions?
- a. Lymphatic system
- b. Endocrine system
- c. Urinary system
- d. Digestive system
Bonds are broken during which type of reaction?
- a. Anabolic
- b. Catabolic
- c. Synthesis
- d. Digestive
All of the following affect the rate of a reaction EXCEPT:
- a. temperature
- b. the concentration of reactants
- c. particle size
- d. polarity

Key Equations and Concepts

General chemical reaction:
Enzyme-catalyzed reaction rate:
First law of thermodynamics:

Additional info: Some explanations and examples have been expanded for clarity and completeness based on standard Anatomy & Physiology curriculum.