Neural vs. Hormonal
The Neural System is only 3% of your body
weight, but is the most complex organ system.
Nervous impulses are fast acting (milliseconds)
but short lived.
The nervous syst
The Anatomy of the Muscular System
Approximately 700 skeletal muscles have been
Two factors interact to determine the effect of
1. the anatomical arrangement of muscle fibers
2. the way the muscle attaches to the skel
Chondrocytes are the only cells found in the cartilage
Chondrocytes live in small chambers called lacunae
(plural, lacuna singular)
Avascular so all nutrient and waste transfer must
occur by diffusion through the matrix.
The general senses are pain, temperature,
touch, pressure, vibration, and proprioception.
Receptors for those sensations are distributed
throughout the body.
A sensory receptor is a specialized cell that,
when stimulated, sends a
In addition to relaying information to and from the
brain, the spinal cord integrates an processes
information on its own.
i.e.- A reflex controlled in the spinal cord, not in the
brain, makes you drop a scalding-hot frying
pan after you have accident
Primary Functions of Skeletal System
2. storage of minerals & lipids
-calcium salts provide vital minerals
-lipids are in stored yellow marrow
3. blood cell production
-RBCs, WBCs, and other constituents produced
Introduction to the Organization of the Brain
98% of the bodys neural tissue is in the brain
An avg. human brain weighs 1.4 kg (3lbs.) and has
a volume of 1200 cc
brains average about 10% bigger than brains
There is no correlation btn. brain size and