Anatomy
The study of body structure (need to know anatomy to understand physiology)
Physiology
Study of function of body
Gross/macroscopic
Big things
Microscopic
Tiny
Levels of organization
atoms, molecules, cells, tissues, organs, organ systems, organisms
respiratory system
Lungs/ ability to breathe
nervous system
Brain/ tells your body what to do
Skeletal system
Femur/structure of your body
urinary system
Kidneys/ get rid of waste
reproductive system
Testicles/make life
endocrine system
Pituitary/ releases hormones
lymphatic system
Lymph nodes/fights infections
cardiovascular system
Heart/pump blood through body
Digestive system
Stomach/breaks down food
Muscular System
Deltoid/movement
integumentary system
Skin/ protection
What must your body do to stay alive?
Breathe, take in water and nutrients, excrete waste, move, maintain homeostasis, rest, grow and mature, reproduce, maintain boundaries
Survival needs of the body
Nutrients (proteins, carbs/sugars, fats/lipids), oxygen, water, stable body temperature, atmospheric pressure
Homeostasis
Stable body condition, dynamic equilibrium
How does homeostasis work?
1. Receptor detects a stimulus 2.brain decides what to do 3. React to fix it
Feedback mechanisms
Negative feedback:shuts off the original stimulus, or reduces its intensity
Feedback mechanisms p
Positive feedback: increases the original stimulus to push the variable farther
examples of positive feedback
Labor pains, blood clots
Examples of negative feedback
Dry eyes, sneeze, breathing