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Biology · Grades 9–12

Nervous and hormonal communication

Compare signal routes without forcing an absolute fast-versus-slow rule.

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Learn the idea

Nervous

Neurons transmit electrical changes along membranes and often chemical signals at synapses.

Endocrine

Hormones travel through body fluids to cells with appropriate receptors.

Specificity

A signal affects a cell according to receptors and response machinery, not just proximity.

Comparison

Time scale and duration vary; simple contrasts have exceptions.

Worked examples

What is a synapse in a basic nervous-system model?

Synapses mediate communication between cells.

A junction where a neuron communicates with another cell.

Why does a hormone not produce the same response in every cell it passes?

Target-cell properties determine response.

Cells differ in receptors and response machinery.

Check your understanding

  1. How do many endocrine signals travel?

    1. Through body fluids such as blood.
    2. Only through wooden tubes.
    3. Only outside the body.

  2. A supplied signal travels 12 distance units in 3 time units. Find its average model speed.

  3. Why is saying all hormonal responses are slow too absolute?

Answers and marking notes

Answers and marking notes
  1. Through body fluids such as blood.

    Hormones can circulate to distant target cells.

  2. 4

    12/3 = 4 distance units per time unit.

  3. Hormones differ in mechanisms and response timing.

    The textbook contrast is a generalization, not a universal law.

Further reading and review references

These are reference links, not copied exercises, institutional endorsement or proof of independent review.

Independent educational review required. Grade bands are approximate; these are not officially aligned curricula.