A&P Lab 1 Notes (Comprehensive)

Testing and Course Policy

• Weekly quizzes based on the lab content from prior sessions, administered at the start of class. Do not be late or you will receive a zero.
• You will have two lowest quiz grades dropped (policy tied to two allowed lab absences).
• Midterm scheduled in week 7.
• Lab final scheduled in week 15.

Anatomy and Physiology Lab 1 Overview

• Course: Anatomy and Physiology Lab 1, Bio 150
• Instructor: Sabah Ahmed, M.D.
• Material appears as a sequence of figures and sections covering anatomy concepts, measurement systems, scientific methods, and microscope usage.
• Figures referenced include:
  • Figure 1.2: Gross vs. Microscopic Anatomy (LM × 1600; nerve cells in brain)
  • Figure 1.3: Levels of Structural Organization (six levels from chemical building blocks to entire organism)
  • Figure 1.4–1.5: Organ Systems and their grouping of organs
  • Figure 1.12: Regions of the Human Body (anterior and posterior views; boldface labels)
  • Figure 1.13: Directional Terms Applied to the Human Body (paired terms)
  • Figure 1.14: Planes of the Body (sagittal, frontal/coronal, transverse)
  • Figure 1.15: Dorsal and Ventral Body Cavities (ventral: thoracic and abdominopelvic; dorsal: cranial and spinal)
  • Figure 1.16: Regions and Quadrants of the Peritoneal Cavity (nine abdominal regions and four abdominal quadrants)
  • Figure 1.17: Serous Membrane (pericardial cavity, reflection over heart)

Gross vs. Microscopic Anatomy

• Gross anatomy: large structures (e.g., brain)
• Microscopic anatomy: same structures viewed at a cellular or subcellular level
• Example in figure: brain nerve cells shown in micrograph (LM × 1600)

Structural Organization of the Human Body

• Six distinct levels of increasing complexity (from smallest chemical building blocks to the whole organism)
• Emphasis on how structures at each level relate to function

Organ Systems of the Human Body

• Organs that work together are grouped into organ systems
• Understanding how systems interact is key to physiology and anatomy

Regions and Planes of the Body

• Regions: body labeled in anatomical position for anterior (front) and posterior (back) views (Figure 1.12)
• Directional terms: paired terms used to describe locations (Figure 1.13)
• Planes: sagittal, frontal (coronal), and transverse planes (Figure 1.14)
• Cavities: dorsal and ventral body cavities (Figure 1.15)

Ventral and Dorsal Cavities

• Ventral cavity includes thoracic and abdominopelvic cavities and their subdivisions
• Dorsal cavity includes cranial and spinal cavities

Peritoneal Cavity Regions and Quadrants

• Peritoneal cavity has two organizational schemes:
  • Nine abdominal regions (Figure 1.16a)
  • Four abdominal quadrants (Figure 1.16b)

Serous Membranes

• Serous membranes line the pericardial cavity and reflect back to cover the heart
• Analogy: similar to an underinflated balloon forming two layers around a fist

Metric Measuring System

• Length: $ext{meters}$
• Mass: $ext{grams}$
• Volume: $ext{liters}$
• Time: $ext{seconds}$
• Temperature: $ext{Celsius}$

Magnitude and Unit Prefixes (Metric System)

• Bigger unit to smaller unit (move decimal to the right; multiply by powers of 10):
  • kilo- : $10^3$
  • hecto- : $10^2$
  • deca- : $10^1$
  • base unit
  • deci- : $10^{-1}$
  • centi- : $10^{-2}$
  • milli- : $10^{-3}$
• To change units, move the decimal point accordingly.
• Example: $2.3\ \text{km} = 2300\ \text{m}$
• Note: The sequence 103 102 101 100 101 102 103 represents powers of 10 used for prefixes; interpret as appropriate when converting units.
• Rule: Smaller units to bigger units require division (divide by 10, 100, etc.).

Scientific Method

• Steps (in order):
  1. Ask a Question
  2. Do Background Research
  3. Form a Hypothesis
  4. Test Your Hypothesis (Experimentation)
  5. Analyze the Data
  6. Determine Your Conclusion
• Visual layout often shows the steps iterated in a non-linear way, but the sequence above is the typical flow

Intro to Microscope

• Resource noted: AmoebaSisters (introductory material)

Parts of the Microscope (Overview)

• Eyepiece (ocular lens): magnification $10\times$
• Tube: connects the eyepiece to the objective lenses
• Revolving Nosepiece (Turret): holds two or more objective lenses; rotates to switch magnification
• Objective Lenses: set of 3 or 4 lenses; changes magnification
• Stage: flat platform for slides; stage clips hold slides in place
• Coarse Focus adjustment knob: moves stage to roughly focus the image
• Fine Focus adjustment knob: fine-tunes focus after using coarse knob
• Rack Stop: prevents objective from moving too far toward the slide
• Arm: supports the tube and connects to the base
• Illuminator: steady light source (replaces mirror in modern microscopes)
• Base: bottom support for the microscope

Parts of the Microscope (Expanded)

• Eyepiece lens: located at the top; 10x magnification
• Tube: connects eyepiece to objective lenses
• Revolving Nosepiece (Turret): rotates to change objective power
• Objective Lenses: multiple lenses (3–4) to change magnification
• Coarse Focus knob: large adjustment to bring image into rough focus
• Fine Focus knob: small, precise adjustments for clear focus
• Stage with Stage Clips: holds slides in place
• Rack Stop: physical limit to protect lenses and slides
• Arm: supports the optical components and attaches to the base
• Illuminator: built-in light source to illuminate the specimen
• Base: provides stability and houses the illuminator
• Condenser: focuses light onto the specimen
• Diaphragm or Iris: controls the amount of light reaching the specimen

Additional Microscope Components (as shown in figures)

• Condenser: focuses light onto the specimen
• Diaphragm/Iris: controls light intensity reaching the specimen

Magnification and Resolution

• Magnification: making the image larger
• Resolution: ability to distinguish two separate points as distinct
• Relationship: higher magnification may reduce resolution if optical quality or lighting is insufficient

Controlling Magnification on the Microscope

• Two controls contribute to total magnification:
  • Eyepiece lens magnification: $10\times$
  • Objective lens magnification (example shown): $4\times$
• Total magnification example:
  • $\text{Total magnification} = (\text{Eyepiece magnification}) \times (\text{Objective magnification}) = 10 \times 4 = 40$
• Example shown: 40X total magnification

Steps for Using the Microscope (Starting and Focusing)

1. Start at the lowest magnification (objective lens at 4X).
2. Clip the slide to the stage.
3. Use the coarse focus to move the stage and bring the image into rough focus.
4. Move the stage slowly to avoid crashing the lens into the slide.
5. Use the fine knob to fine-tune the focus.
6. Increase magnification by rotating the revolving nosepiece to higher power.
7. Ensure the light is turned on for proper illumination.

Microscope Clean-Up Checklist

• Remove the slide
• Turn off the light
• Lower the stage
• Switch to the lowest objective lens
• Secure the power cord and cover the microscope

Safety and Lab Etiquette

• No food or drinks in the lab
• Closed-toe shoes required
• Always carry the microscope with both hands (one on the base, one on the arm)
• Use the coarse adjustment knob before the fine adjustment
• Be careful not to damage lenses when moving the stage
• When in doubt, ask questions
• Clean up and push the chair in before leaving