Cell Function And Homeostasis Flashcards
What are Lysosomes?
Small membranous vesicles containing enzymes
What do each endoplasmic reticulum do?
Rough- studded with ribosomes for protein synthesis and leaves by exocytosis
Smooth- synthesis’s lipids and steroid hormones
What do the Golgi apparatus do?
Synthesised proteins are packaged and stored here
What does chromatin do?
Helps compact DNA from longer strands into smaller packages as part of mitosis
What’s a nucleus?
Largest organelle, contains genetic material
What does the plasma membrane do?
Controls the passage of substances in and out of the cell regulating intracellular environment.
What do ribosomes do?
Synthesises protein from amino acids using RNA template
What do the mitochondria do?
Aerobic respiration with O2 and ATP
What does the centrioles do?
Responsible for producing cellular spindles in mitosis as well as making microtubules
What are the cell actions?
Reproduce
Nourishment
Movement
Excretion
Growth
Respiration
What is the red blood cell structure and what does it do?
The red blood cell is a concave shape and carries oxygen as well as rids carbon dioxide.
What the structure of Cardiac cells and what are they for?
The cardiac cells have splits so they can contract and control the heart pumping.
What are the 4 cellular tissue types?
Connective tissue
Epithelial tissue
Muscle tissue
Nervous tissue
What are the 6 levels of organisation for cells to be come organs?
- Chemical level
2.Cellular level
3.Tissue level - Organ level
- System level
- Organismal level
What’s cell suicide called?
Apoptosis
Which cells never get replaced after cell suicide?
Muscle cells and Nervous system cells
What is homeostasis?
It’s when an organisms conditions are maintained within the internal environments physiological limits.
What 4 things need to be kept constant to protect the cell?
- Chemical constitution
- Osmotic pressure (H2O)
- Temperature
- O2 and CO2 levels
Explain typical homeostatic control system?
Change stimulus, receptor detects, control centre,and effector then corrective response
What’s a negative feedback?
If response reverses original stimulus
What’s a positive feedback?
If response enhances original stimulus
