Part 5: Mitosis Flashcards
(9 cards)
1
Q
What is mitosis
A
Cell division for cell replacement and growth
2
Q
How long do cells in our lower digestive tract last
A
3 days
3
Q
How often do skin cells die
A
Every 2-4 weeks
4
Q
How often do red blood cells die
A
Every 4 months
5
Q
How do we get lost cells back
A
Cells divide by mitosis to make identical cells still with 46 chromosomes.
6
Q
How do cells know when to divide
A
- Damaged cells release DAMPS and growth factors
- Healthy cells interpret the signals
- Signal transduction happens
- Cells divide to repair the tissue
7
Q
What are damps
A
Normal internal cell parts
8
Q
When does growth in humans happen
A
- During embryo development (right after fertilization)
- Childhood and adolescence (bone, muscle, organ)
- Adulthood (slower growth but happens for tissue maintenance)
9
Q
What starts puberty and growth
A
Hypothalamus in the brain
Hormones-HGH
Sex hormones (test,estrogen)
Thyroid hormones (t3, t4)
