Water uptake and loss in plant cells
Vegetable leaves become firmer and crisper in clean water, but release water when salted. How do plant cells gain and lose water?
Explore freely
BIOLOGY · 9 EXPLORATION STEPS
Generation and conduction of nerve impulses
Starting within 0.1 s of the gun is classified as a false start (original textbook, p.27). How is an excitation signal transmitted through the body?
Free · No sign-in needed to learn
▶ Open 3D simulationYOUR EXPLORATION
One step, one new insight.
- 01
Nerve impulse
- 02
Resting potential
- 03
Action potential
- 04
Local currents
- 05
Synapse
- 06
Direction and delay
- 07
Cocaine
- 08
External Na⁺
- 09
Assessment
KEEP EXPLORING
Explore more together
Transport across cell membranes
Across the same cell membrane, why can oxygen pass unaided, glucose needs a transport protein, and K⁺ can still move against its concentration gradient?
Explore freely
Observing mitosis in root-tip meristematic tissue
Which cells in an onion root tip are dividing? Can counting cells estimate the duration of each phase?
Explore freely