1. Work through these videos, rewinding and rewatching as needed to help your understanding.
Anatomy of a Neuron
Sodium/Potassium Pump
Action Potentials
Conduction in Myelinated Axons
Neuronal Chemical Synapses
2. Note: Nerve Signals
3. Assigned work: Read 11.2, do p. 529 # 1-3.
SNC2D
1. Activity: Viewing the phases of mitosis in an onion root tip.
2. Assigned work: Read 2.7, do p. 55 # 1-8
Thanks to Emily M. For the excellent images below taken through the eyepiece of her microscope:
Onion Root Tip - Metaphase
(cell in the centre- chromosomes are lined up across the middle of the cell)
Onion Root Tip - Anaphase
(2 adjacent cells in the same phase! - see the chromosomes separating as they are pulled towards the opposite ends of the cell)
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