Science Test: Organ Systems Flashcards
Rules when it comes to microscope drawings:
- specimen needs to be centered
- do not label inside the field of view & do not cross names
- have a title
- make sure it is properly proportioned
Why do cells need to divide
- to repair
- to reproduce
cell rule
- basic structure & function of organism
- cells come from pre-existing cells
- organisms have 1 or more cells
The stage which cells spend most time in:
Interphase
Why do cells spend most time in interphase?
Because DNA is being copied & the organelles are being formed
Prophase:
DNA coils up Ito double stranded chromosomes
Metaphase
Double stranded chromosomes line up along the center (strands are visible)
Anaphase
Double stranded chromosomes are pulled away by spindle fibers
Telophase
Single stranded chromosomes at each end of the cell
-(cell membrane pinches to split cytoplasm)
Interphase
The phase of the cell where most time is spent. Copies DNA here and sets up organelles
What is cancer
DNA dividing uncontrollably
What causes cancer
Smoking, diet, products, genetics, radiation, viruses
What are carcinogens
Things that cause cancer
Define stem cells
Cells of the body which can divide and become differentiated. They can take place of cancerous cells
How is the body organized from the smallest cell to an organism:
Cells –> tissues –> organs –> organ systems
Role of respiratory : in order
Enters nose or mouth
- pharynx
- throat
- trachea
- bronchi
- bronchioles –> lungs –> alveoli
What does the resp system do?
Takes in oxygen and we let out carbon dioxide as we breath
What happens to alveoli when we breath?
Alveoli increase surface area for maximum gas intake
Define diffusion
Movement of molecules from an area of high concentration to an area of low concentration
Role of digestive system
To absorb nutrients for our body and removes waste
Path that food takes :
-mouth –> esophagus –> stomach –> small Intestine –> large intestine –> rectum
Examples of physical digestion
Chewing and stomach churning
Chemical digestion examples
Stomach acid & enzymes and the small intestine process
Role of liver:
Makes bile for small intestine & proteins important for blood clotting.