OCR · A-Level · Biology
Course version: H420 · Version from Sept 2025
(j) the coordination of responses by the nervous and endocrine systems
Full specification wording
Plant and animal responses: (j) the coordination of responses by the nervous and endocrine systems
The nervous and endocrine systems coordinate responses by different means.
Checked against the OCR H420 specification (opens in a new tab) on .
- Point 9 of 12
- 4 key terms
Study notes
From the checked teaching notes for this specification point.
The idea
The nervous and endocrine systems coordinate responses by different means. The nervous system uses electrical impulses along neurones and chemical neurotransmitters across synapses; transmission is fast and the response is short-lived and precisely targeted at specific effectors. The endocrine system uses hormones secreted by glands into the blood; hormones travel to target cells with complementary receptors, so transmission is slower but the effect is longer-lasting and can reach many cells throughout the body. The two systems work together: for example, the hypothalamus links them by releasing hormones that control the pituitary gland, and the adrenal glands release adrenaline under nervous stimulation to raise heart rate and blood glucose during the fight-or-flight response.
What earns the marks
- The nervous system transmits electrical impulses along neurones and uses neurotransmitters at synapses, giving fast, short-lived, targeted responses.
- The endocrine system secretes hormones from glands into the blood, which reach target cells with complementary receptors, giving slower, longer-lasting responses.
- Hormones can affect many cells throughout the body, whereas nervous impulses act on specific effectors.
- The hypothalamus links the two systems by controlling the pituitary gland.
- Adrenaline released from the adrenal glands under nervous stimulation coordinates the fight-or-flight response, raising heart rate and blood glucose.
- Coordination means matching the response to the stimulus, with the two systems providing complementary rapid and sustained control.
Common mistakes and how to put them right
Assuming hormones act faster than nerve impulses.
Put it right by stating nervous transmission is fast and short-lived while hormonal responses are slower and longer-lasting.
Thinking hormones act on all cells equally.
Put it right by noting hormones act only on target cells with complementary receptors.
Treating the two systems as entirely separate.
Put it right by giving the hypothalamus–pituitary link and nervous control of adrenaline release as examples of coordination.
Confusing the transmission route.
Put it right by stating nerve impulses travel along neurones while hormones travel in the blood.
Exam tips
- Compare the two systems on speed, duration, route and target specificity in a structured way.
- Use the fight-or-flight response as a concrete example of the two systems working together.
- Name the hypothalamus and pituitary as the link between nervous and endocrine control.
Try the lesson
The start of the Plant and animal responses: (j) the coordination of responses by the nervous and endocrine systems lesson, made from checked teaching notes for this specification point.
Have a go first
By which route are hormones transported from an endocrine gland to its target cells?
Listen
The nervous and endocrine systems coordinate responses by different means. The nervous system uses electrical impulses along neurones and chemical neurotransmitters across synapses; transmission is fast and the response is short-lived and precisely targeted at specific effectors. The endocrine system uses hormones secreted by glands into the blood; hormones travel to target cells with complementary receptors, so transmission is slower but the effect is longer-lasting and can reach many cells throughout the body. The two systems work together: for example, the hypothalamus links them by releasing hormones that control the pituitary gland, and the adrenal glands release adrenaline under nervous stimulation to raise heart rate and blood glucose during the fight-or-flight response. A strong answer earns marks for these points. The nervous system transmits electrical impulses along neurones and uses neurotransmitters at synapses, giving fast, short-lived, targeted responses. The endocrine system secretes hormones from glands into the blood, which reach target cells with complementary receptors, giving slower, longer-lasting responses. Hormones can affect many cells throughout the body, whereas nervous impulses act on specific effectors. The hypothalamus links the two systems by controlling the pituitary gland. A common slip: Assuming hormones act faster than nerve impulses. Instead, stating nervous transmission is fast and short-lived while hormonal responses are slower and longer-lasting. Exam tip: Compare the two systems on speed, duration, route and target specificity in a structured way.
Key words
Say what each word means before you turn the card.
Nervous versus endocrine transmission
Try answering aloud or in your head before turning the card.
Hormones and target-cell receptors
Try answering aloud or in your head before turning the card.
Hypothalamus–pituitary link
Try answering aloud or in your head before turning the card.
Fight-or-flight coordination
Try answering aloud or in your head before turning the card.
See every definition
- Nervous versus endocrine transmission
- The nervous system transmits electrical impulses along neurones and uses neurotransmitters at synapses, giving fast, short-lived, targeted responses, while the endocrine system secretes hormones from glands into the blood, giving slower, longer-lasting responses.
- Hormones and target-cell receptors
- Hormones travel in the blood to target cells with complementary receptors, so they can affect many cells throughout the body, whereas nervous impulses act on specific effectors.
- Hypothalamus–pituitary link
- The hypothalamus links the nervous and endocrine systems by releasing hormones that control the pituitary gland.
- Fight-or-flight coordination
- Adrenaline released from the adrenal glands under nervous stimulation raises heart rate and blood glucose during the fight-or-flight response.
There is more to this lesson
The full lesson goes on to check your understanding and help you earn the marks. Create a free account to carry on, with your progress saved.
A week of Premium from your first lesson · Then the free plan continues · No card, no charge
Test your understanding of Plant and animal responses: (j) the coordination of responses by the nervous and endocrine systems
Active recall beats re-reading. Take an instant quiz now to test what you’ve learned and lock it into long-term memory.
A week of Premium from your first lesson · Then the free plan continues · No card, no charge