Anatomy & Physiology (LAB 2a) - Microscope; Nervous & Muscle Tissue

Head of microscope

Houses ocular & objective lenses

Binocular

eyepiece of microscope

Revolving nosepiece

holds the objective lenses

Objective lenses

magnify at a power of 4x, 10x, 40x, & 100x

Arm of microscope

handle; connects head to base

On/Off switch

turns the microscope on or off

Rheostat

Dimmer knob, controls brightness (light intensity)

Stage of microscope

holds the microscope slide in position

Mechanical stage

holds the slide in position for viewing and has two adjustable knobs that control the precise movement of the slide

Condenser lense

focuses light onto the specimen

Z-axis stage knob

forward and back

X-axis stage knob

moves side to side

Iris diaphragm

reduces the amount of light by opening or closing

Sub stage light

a light within the base providing the light source for illumination of the specimen

Base of microscope

bottom of the microscope

Coarse adjustment

large knob used with 4x & 10x ONLY

Fine adjustment

small knob used in 40x & 100x

Real image

projected by the objective lens to the ocular lens

Virtual image

seen by the eyes

Tension adjustment ring

lies behind the coarse adjustment knob

Histology

study of tissues

Nervous tissue

control, communication, & coordination
- located in brain, spinal cord, & nerves

Neurons

nerve cells; generate, receive, & transmit AP nerve impulses

Muscle tissue

contract, excitable, highly cellular, actin & myosin fibers, & well vascularized
- smooth muscle
- cardiac muscle
- skeletal muscle

Smooth muscle tissue

- NO striations
- spindle-shaped
- single nucleus
- involuntary control
- line walls of hollow organs
- found in digestive, urinary organs, uterus, airways, blood vessels

Cardiac muscle tissue

- slight striations
- contracts to propel blood thru vascular system
- irregular & branched
- unicleated
- involuntary control
- found within heart wall & septum

Intercalated discs

unique transverse-thickened junctions which aid in contraction

Desmosomes (anchor junctions)

strengthen & prevent separation of cells during contractions

Gap junctions

allow quick passage of action potentials

Skeletal muscle tissue

- obvious striations
- long & cylindrical
- voluntary movement
- long cylindrical cells = muscle fibers
- multinucleated
- found attached to bone

You are looking at muscle tissue thru the microscope & you see striped branching cells that connect with one another. What type of cell are you looking at?

Cardiac muscle cells