Human Physiology
6 notes tagged Human Physiology.
- Science & Technology
Blood, Lymph and the Circulatory System
Blood's plasma and formed elements, the ABO and Rh systems, lymph, the heart's chambers and valves, the cardiac cycle, and double circulation.
- Science & Technology
Breathing and Exchange of Gases
A normal breath moves only about 500 ml of air, a small fraction of what the lungs can actually hold, and most of the carbon dioxide you exhale never travelled as a dissolved gas at all.
- Science & Technology
Excretory Products and their Elimination
A falling glomerular filtration rate triggers a hormone cascade that ends in a vasoconstrictor powerful enough to raise blood pressure specifically to push that filtration rate back up.
- Science & Technology
Locomotion and Movement: Muscles and the Skeleton
During muscle contraction the A band never changes length at all, since the filaments themselves don't shrink, they just slide further into each other.
- Science & Technology
Neural Control and Coordination
A resting neuron sits at about -70 millivolts purely because a pump keeps trading three sodium ions out for only two potassium ions in, a lopsided swap the whole nervous system runs on.
- Science & Technology
Chemical Coordination and Integration: The Endocrine System
The posterior pituitary doesn't actually make the two hormones it releases, it just stores and ships what the hypothalamus next door already produced.