First Midterm Flashcards
i. List the various levels of structural organization in the human body (i.e. from atom to organism)
Atoms (chemical level) molecule (chemical level) organelle (cellular level) smooth muscle cell (cellular level) Tissue Level Organ Level Organ System Level Organism Level
What does the Integumentary System do
protects against mechanical injury, infection, excessive heat/cold, and drying out
What does the Skeletal system do
supports body, protects internal organs, provides framework for muscles to produce movement
What does the Muscular system do
- generates heat
- creates movement
- maintains posture
What does the Immune system do
defends against infections and cancer
What does the Lymphatic system do
returns excess body fluid to circulatory system and functions as a part of the immune system
What does the Endocrine system do
secretes hormones that regulate body activities
What does the Circulatory system do
delivers nutrients and oxygen to cells and carries carbon dioxide to lungs, and metabolic wastes to excretory organs (Kidneys)
What does the Respiratory system do
exchanges gases with the environment, supplies oxygen, disposes of carbon dioxide
What does the Urinary (excretory) system do
removes nitrogen containing waste from blood, and regulates chemical makeup, pH, and water balance of blood
What does the Digestive system do
Ingests and breaks down food, absorbs nutrients, and eliminates undigested material
What does the Reproductive system do
Produces gametes and sex hormones
What does the Nervous system do
Coordinates body activities by detecting stimuli
Define Homestasis
the tendency toward a relatively stable equilibrium between interdependent elements, especially as maintained by physiological processes.
What is negative feedback system and what does it do
- Helps maintain Homeostasis
- Effector counteracts the change detected
What is the positive feedback system
- helps maintain Homeostasis
- Effector responds to intensify the original change
