1. General Biology lab
Lab 7&8
Animal Tissues

2. Muscle Tissue Muscle Tissue There are three type of muscle fibers
tissue composed of fibers capable of contracting to effect bodily movement.
There are three type of muscle fibers
Skeletal or striated muscle fibers
Cardiac muscle fibers
Smooth or Visceral Muscle Fiber

3. Skeletal or striated muscle fibers
They are striated and voluntary fibers attached to the skeleton forming skeletal muscles.
Skeletal muscle fibers are 1mm to 40mm or more in length.
Many fibers fuse together forming syncetium while their nuclei are peripheral.
Myofibrils are the contractile elements of muscle fibers.
They are contain actins and myosins under light microscope .
They show regular alternation of light and dark band striation

7. Cardiac muscle fibers :
They are striated and involuntary (rhythmic) fibers present only in heart muscles.
Their nuclei are central.
These fibers are branched and forming syncetium with intercalated discs found in-between the syncetia.
Intercalated discs connect the ends of cardiac muscle fibers to one another.
Have the same arrangement of actin and myosin as skeletal muscle fibers

9. Smooth or Visceral Muscle Fiber They are non-striated and involuntary.
They exist in viscera and blood vessels.
Length of these fibers range from 15 microns in blood vessels to 500 microns in pregnant uterus.
The fibers are poor in blood supply compared to skeletal muscles.
Long, and spindle shaped
Have a single, central nucleus

13. Nervous Tissue Nervous tissue
is responsible for sensing stimuli and transmitting signals to and from different parts of an organism.
Is the basic tissue from which the nervous system
They arise from ectoderm

14. The nerve fiber is the axon of the nerve cell.
Nerve cells called neurons .
The neuron consists of
the cell body (Soma)
axon
dendrites
The neurons act for impulse transmission .
The nerve fiber is the axon of the nerve cell.