Homeostasis
The ability of an organism to maintain a stable internal environment.
What is homeostasis?
Give 2 example of pathogens.
What are virus, bacteria, fungi, protist ?
T-cells mature in which part of the body.
What is Thymus?
The longest phase of the cell cycle
What is interphase?
B-cells developed in which part of the body
What is bone marrow?
Give one disruption to homeostasis
What are
1. sensors fail (don’t detect changes)
2. targets do not receive messages (nerve issues)
3. injury (overwhelm homeostatic controls)
4. illness (viruses or bacteria)?
A chemical name tags on the surface of every cell.
What is antigen?
An INCREASE in one action causes an INCREASE in another, for example when you are bleeding. Your body produces more and more platelets until your body stops bleeding.
What is positive feedback?
Phase of mitosis in which chromosomes line up in the middle.
What is metaphase?
Give one disease that affects the immune system, excluding HIV or AIDS.
What are lupus, diabetes, multiple sclerosis, rheumatoid arthritis?
Two aspects of the body that must be maintained in order to achieve homeostasis.
What are pH, Body Temperature, oxygen level, blood volume, and Blood Sugar?
Give 3 points of entry for pathogens.
What are digestive system, respiratory system, urinary system, genitals, break in skin ?
The breathing mechanism during exercise when your CO2 increases and your O2 decreases, and your body breathes faster, is an example of
What is negative feedback?
Three forms of DNA in a cell cycle
What are chromatins, chromatids, chromosomes.
Give three reasons why cells need to divide.
1. Repair
2. Growth
3. If cell gets too big, it cannot get enough nutrients into the cell and wastes out of the cell.
Give 4 control system that helps regulate homeostasis?
What are sensors (5 senses), control center (brain), communication system (nerves), targets (ex. muscles).
Give three positive effect of fever.
1. slows growth of germs
2. helps macrophages
3. speeds up repair of tissues
Differentiate active immunity and passive immunity.
Active immunity is through vaccination.
Passive immunity is through breastfeeding, making our body healthy.
Uncontrollable cell division is called
What is cancer?
Give three mechanisms of homeostasis when it is cold
What are vasoconstriction, shivering, piloerection, and curling?
If homeostasis is not achieved this occurs...
What is death!
Scientist the developed the first vacine against polio virus.
Who is Jonas Salk?
A type of cell is infected by the AIDS virus.
What is T-cells?
Similarity and difference between cytokinesis and telophase
Similarity: Telophase and cytokinesis has 2 nuclei.
Difference: Cytoplasm is shared during Telophase, cytoplasm is separate during Cytokinesis.
Compare and contrast. Specialized cell and stem cell.
Specialized cells are cells that have specific functions, stem cells are cells that can change into different type of cells. Both are cells.