Unit 1 Study Guide: Foundations of Anatomy & Physiology, Cell Division, and Chemistry

Introduction to Anatomy & Physiology

Basic Concepts and Terminology

Anatomy & Physiology is the study of the structure and function of the human body. Understanding foundational terminology and processes is essential for success in this course.

• Homeostasis: The maintenance of a stable internal environment despite changes in external conditions. Examples include regulation of body temperature and blood glucose levels.

• Negative Feedback Mechanisms: Processes that counteract changes in the body to maintain homeostasis. Example: Regulation of blood sugar by insulin.

• Positive Feedback Mechanisms: Processes that amplify changes. Example: Blood clotting cascade.

• Physiology: The study of how body parts function.

• Anatomy: The study of body structure.

Cellular and Molecular Foundations

DNA and Cellular Processes

Cells are the basic units of life. DNA encodes genetic information and directs cellular activities.

• DNA: Deoxyribonucleic acid, the molecule that stores genetic information.

• Central Dogma: DNA is transcribed to RNA, which is translated to protein.

• Dehydration Synthesis: A chemical reaction that joins molecules by removing water. Example: Formation of peptide bonds in proteins.

Basic Chemistry for Anatomy & Physiology

Chemistry is fundamental to understanding biological processes. Elements and molecules form the basis of cellular structure and function.

• Elements: Basic building blocks of matter. Major elements in the human body: Oxygen, Carbon, Hydrogen, Nitrogen.

• Atoms: The smallest units of elements.

• Molecules: Combinations of atoms. Examples: H2O (water), CH4 (methane), NH2NO2 (nitramide).

• Ions: Atoms or molecules with a charge. Types: Positive (cation), Negative (anion), Neutral.

Cell Structure and Function

Cell Cycle and Cell Types

Cells undergo cycles of growth and division. Understanding the phases and types of cell division is crucial.

• Cell Cycle: The series of events that cells go through as they grow and divide. Phases: G1, S, G2, M (mitosis/meiosis).

• Cell Types: Prokaryotic (no nucleus) and Eukaryotic (nucleus present).

Cellular Transport Mechanisms

Cells exchange materials with their environment through various transport mechanisms.

• Passive Transport: Movement of substances without energy input. Examples: Diffusion, osmosis, facilitated diffusion.

• Active Transport: Movement of substances against a concentration gradient, requiring energy. Examples: Sodium-potassium pump.

• Endocytosis/Exocytosis: Processes for bulk transport into and out of cells.

Cell Division: Mitosis vs. Meiosis

Comparison Table: Mitosis and Meiosis

Mitosis and meiosis are two types of cell division with distinct purposes and outcomes.

Questions	Mitosis	Meiosis
Number of cells at beginning of division?	1	1
Is parent cell haploid or diploid?	diploid	diploid
Number of cells at end of division?	2	4
Are daughter cells haploid or diploid?	diploid	haploid
Are daughter cells identical to each other?	yes	no
Are daughter cells identical to parent cell?	yes	no
How many divisions?	1	2
Type of cells does this division occur?	body cells (somatic cells)	sex/reproductive cells (gametes)
What is the purpose of this type of division?	to produce identical cells to increase cell number for growth/repair	to produce gametes for sexual reproduction

Genetics and Molecular Biology

RNA Types and Protein Synthesis

Genetic information is expressed through the synthesis of proteins, involving several types of RNA.

• mRNA (messenger RNA): Carries genetic code from DNA to ribosomes.

• tRNA (transfer RNA): Brings amino acids to ribosomes during protein synthesis.

• rRNA (ribosomal RNA): Forms the core of ribosome structure and catalyzes protein synthesis.

• Protein Synthesis: The process of translating genetic information into proteins. Equation: $\text{DNA} \rightarrow \text{RNA} \rightarrow \text{Protein}$

Integumentary System

Skin Structure and Pigmentation

The skin is the largest organ of the body and serves as a barrier and regulatory interface.

• Negative Feedback in Skin: Example includes temperature regulation via sweating or shivering.

• Factors Affecting Skin Pigmentation: Genetics, exposure to sunlight, hormones, and disease can all influence skin color.

Tissues: Classification and Function

Major Tissue Groups

Tissues are groups of cells with similar structure and function. Understanding their characteristics is essential for identifying their roles in the body.

• Connective Tissue: Supports, binds, and protects organs. Examples: Bone, blood, adipose tissue.

• Epithelial Tissue: Covers body surfaces and lines cavities.

• Muscle Tissue: Responsible for movement.

• Nervous Tissue: Conducts electrical impulses.

Additional info: For more details on tissue types and their functions, refer to Chapter 4 in your textbook.