1. What happens when a neuron’s membrane depolarizes?of 5
What happens when a neuron’s membrane depolarizes?
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There is a net diffusion of Na out of the cell.
There is a net diffusion of K into the cell.
The neuron’s voltage inside becomes more positive.
The neuron cannot send an action potential.
The inside of the cell becomes more negative relative to the outside

2. A common feature of action potentials is that they:of 5
A common feature of action potentials is that they:
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Cause the membrane to hyperpolarize and then depolarize.
Can travel in more than one direction on an axon.
Are triggered by a depolarization the reaches the threshold.
Move at the same speed along all axons.
Result from the diffusion of Na and K into the cell.

3. Where are neurotransmitter receptors located?of 5
Where are neurotransmitter receptors located?
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On the nuclear membrane
at the nodes of Ranvier
On the postsynaptic neuron’s membrane
On the membrane of the synaptic vesicles
On the myelin sheath

4. of 5
Which of these correctly describes the distribution of ions in a resting neuron?
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Na outside, K inside
K outside, Na inside
Proteins outside; K and Na inside
Na & K outside; water inside only
Ca outside and inside

5. The large intestine in humans:of 5
The large intestine in humans:
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Digests all types of food.
Is the longest part of the intestinal tract.
Absorbs water.
Is connected to the stomach.
All of the above.

6. If I roll a: 1 – On your own, no notes 2 – On your own, with notes
3 – With partner, no notes
4 - with partner, with notes
5 – as a class, no notes
6 – as a class, with notes

7. From what you know about action potentials and synapses, propose three hypotheses for how various anesthetics might prevent pain.

8. The Skeletal System

9. Basic Functions of a Skeleton?

10. Types of Skeletons Exoskeleton Endoskeleton
Sponges, echinoderms and invertebrates
Internal
Calcareous plates in Echinoderms
Bone, cartilage or both in vertebrates
Hydrostatic in other invertebrates
Molluscs and arthropods
External
Plates of chitin or CaCO3

12. The Human Skeleton Living tissue Functions: Support Blood production
Mineral storage
Muscle attachment
Protection

14. The Human Skeleton Starts as cartilage models
OSTEOBLAST cells turn the cartilage to bone
Begins in the middle of the bone by forming a PRIMARY OSSIFICATION CENTER
Same thing begins to happen in the ends of the bones, forming SECONDARY OSSIFICATION CENTERS
When the two centers meet, bone growth stops

17. The Human Skeleton Bone is remodeled throughout your lifetime
OSTEOCLASTS break down bone and then OSTEOBLASTS rebuild in weak areas