Biology 112 Lab Final
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What are the two basic types of microscope?
Light microscope Electron microscope
What are some things light microscopes show?
can observe single cells cell membrane nucleus cytoplasm
What are some things electron microscopes show?
Golgi Er Mitochondria
Why does electron microscope have higher resolution than light?
shorter wavelength allows smaller objects to be observed
What are the two types of electron microscopes?
Scanning Transmission
What does the scanning electron microscope observe?
Surface
What does the transmission electron microscope observe?
Internal “parts”
How does fluorescent microscopy work?
fluorescent antibodies or dyes to observe SPECIFIC parts of the cell
What is the optical lens of the microscope and what magnification?
the eye piece and 10X
What are the objective lenses?
The lenses through which the subject is magnified?
What is the magnification of the objective lenses?
4X, 10X, 45X, and 100X
What is the total magnification of the eye piece and objective lenses?
40X, 100X, 450X, 1000X
What are the functions muscles are responsible for? (2)
body movement organ motion (heart beat)
What type of shape do muscle cells often have?
cylindrical shape
What are muscle cells often called?
muscle fibers
What are the 3 main types of muscle?
skeletal cardiac smooth
What is the length of a muscle cell?
length of the muscle
What is a distinguishing feature of muscle cells?
periphery nuclei (along outside)
What type of look do muscle cells have?
striated
What are the levels of organization of skeletal muscle tissue going from biggest to smallest?
muscle, muscle fiber bundle, individual muscle fiber, fibrils, single myofibril, sarcomere portion
What is the sarcomere composed of?
I band, A band, Z line, thick and thin filaments
What is the thin filament of a sarcomere called?
actin
What is the thick filament of the sarcomere called?
myosin
In muscle contraction what happens to the filaments?
They slide together