9700 · 15.1
Control and coordination in mammals — FAQ
Frequently asked questions for 9700 Control and coordination in mammals. Direct answers first, then deeper explanation — then practise with marking.
What is control and coordination in mammals 9700?
Control and coordination in mammals (Syllabus 9700, Topic 15.1) refers to how the body regulates its internal environment (homeostasis) and responds to external stimuli. It primarily involves the nervous system (fast electrical signals) and the endocrine system (slower chemical hormones) working together. You can master this topic with our free revision lessons and extensive past paper practice for Cambridge A Level Biology.
How do the nervous and endocrine systems differ in mammals?
The nervous system uses rapid, short-lived electrical impulses and neurotransmitters for precise, localised control (e.g., muscle contraction). The endocrine system uses hormones, which are transported via the bloodstream for slower, widespread, and longer-lasting effects (e.g., growth or metabolism). Both are vital for homeostasis, often interacting, such as the hypothalamus influencing hormone release. Our platform offers detailed explanations and practice questions on these distinctions.
How does negative feedback work in mammalian hormonal control?
Negative feedback is a crucial regulatory mechanism where a change in a physiological variable (e.g., blood glucose level) triggers a response that counteracts the initial change, bringing the variable back to its normal range. For example, high blood glucose stimulates insulin release, which lowers glucose, thus 'feeding back negatively' to reduce the stimulus. Learn more about this and other hormonal controls with our comprehensive A Level Biology resources, including past papers and expert mark scheme guidance.