Homeostasis and Cell Signalling (OCR A-Level Biology A): Quizzes
📚Quizzes
Practise the questions
10 questions from this quiz
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Practise the questions
10 questions from this quiz
Which system enables rapid responses in animals?
Which system enables rapid responses in animals?
Nervous system
What form are cell signals almost always in?
What form are cell signals almost always in?
Chemical
Which type of signalling involves hormones transported through the circulatory system?
Which type of signalling involves hormones transported through the circulatory system?
Endocrine signalling
Why can steroid hormones have receptors in the cytoplasm?
Why can steroid hormones have receptors in the cytoplasm?
They can diffuse through the cell membrane
What do target cells possess that allows hormones to affect them specifically?
What do target cells possess that allows hormones to affect them specifically?
Hormone-specific receptors
How do endocrine glands secrete hormones?
How do endocrine glands secrete hormones?
Directly into the bloodstream
What is the approximate width of a synaptic gap?
What is the approximate width of a synaptic gap?
20-40 nanometres
What is homeostasis?
What is homeostasis?
Maintenance of near-constant conditions
Which three components are mainly controlled in mammalian homeostasis?
Which three components are mainly controlled in mammalian homeostasis?
Temperature, glucose, water
What does negative feedback do in homeostatic systems?
What does negative feedback do in homeostatic systems?
Reverses deviations from optimal