به انگلیسی

A small squeeze moves a lot of blood

Science · The Human Body · ages 20-21

Name ______________________ Date ____________

What do stretch receptors report?
- Every dip in pressure within seconds
- Blood color
- Hormone names
Which vessels hold the tightest grip on resistance?
- Small arteries
- The large veins
- The capillaries
Fast pressure correction works through heart rate and vessel tone within seconds.
Circle one: True False
A vessel narrows to half its radius. By what factor does its resistance rise? Type the number.
Answer: ______________
A vessel narrows to half its radius. What happens to its resistance?
- It doubles
- It rises sixteen fold
- It halves
Bleeding drops pressure. Which correction lasts into tomorrow?
- The seconds fast neural fix
- Holding your breath
- Kidney volume fix over days
Raising global pressure is always the best way to feed one hungry tissue.
Circle one: True False
Pressure is low but vessels are already fully tightened. What follows?
- Extra tightening still fixes it
- Low flow until volume returns
- Resistance no longer matters

Answer key

For grown-ups. Fold this page away before handing over the rest.

Every dip in pressure within seconds · Receptors in large arteries sense pressure changes fast.
Small arteries · Tiny radius shifts in small arteries swing resistance hugely.
True · Nerves adjust the pump and the pipes almost at once.
16 · Halving gives sixteen times the resistance.
It rises sixteen fold · Halving multiplies resistance sixteen times over.
Kidney volume fix over days · Only refilling salt and water solves the underlying shortfall.
False · Local resistance tuning feeds need without forcing the whole system.
Low flow until volume returns · Tone has hit its ceiling, so only refilling helps.