Biology Ka4 Flashcards
What is homeostasis?
The maintenance of a constant internal body environment
What do enzymes control?
All the functions of a cell (metabolism)
What internal conditions are controlled by enzymes?
Water content of the body.
Blood glucose concentration.
Body temperature.
What is water concentration controlled by?
Osmosis
The concentration of water in your blood should be the same as what?
The salt concentration in your cells
What controls the amount of water in your body?
The kidneys by producing urine or sweat
What controls the concentration of urine?
Nerves and hormones.
The body controls the level of blood with what?
Hormones secreted by the pancreas.
What lowers blood glucose?
Insulin
What raises blood glucose?
Glycogen
Mammals and birds keep a __?
Constant body temperature
What does the body do to warm up?
Shivers, hairs stand on end, sweating stops
What does the body do to cool down?
Sweats, hairs lie flat, blood supply to skin drops
What systems work together to maintain a constant body temperature?
Nervous and hormone systems
What is the endocrine system?
Slower but acts for longer. Carried in blood to all organs, affects target organ only
What do the receptors do?
Detects a stimulus (either the level of something is too high or too low )
What does the coordination centre do?
Receives and processes the information, then organises a response