9700 · 15.1
Control and coordination in mammals
Welcome to Topic 15.1: Control and Coordination in Mammals – a cornerstone of A Level Biology. In this lesson, we'll unravel how the mammalian body maintains **homeostasis** and responds to its environment through the intricate interplay of the **nervous system** and the **endocrine system**. Mastering this topic is crucial for Paper 4, as it frequently tests your understanding of these vital physiological processes and their underlying mechanisms.
Need to know
What you need to know
- **Sensory Neurones:** Transmit impulses from sensory receptors (e.g., in skin or eyes) to the CNS. They have a long dendron and a short axon.
- **Motor Neurones:** Transmit impulses from the CNS to effectors (muscles or glands). They have a long axon and many short dendrites.
- **Relay Neurones (Interneurones):** Found entirely within the CNS, they transmit impulses between sensory and motor neurones. They have a short axon and many dendrites.
Explanation
Control and coordination in mammals
- **Sensory Neurones:** Transmit impulses from sensory receptors (e.g., in skin or eyes) to the CNS. They have a long dendron and a short axon.
- **Motor Neurones:** Transmit impulses from the CNS to effectors (muscles or glands). They have a long axon and many short dendrites.
- **Relay Neurones (Interneurones):** Found entirely within the CNS, they transmit impulses between sensory and motor neurones. They have a short axon and many dendrites.