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What happens when a neuron’s membrane depolarizes?

0 of 5. :60. What happens when a neuron’s membrane depolarizes?. 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.

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What happens when a neuron’s membrane depolarizes?

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  1. 0 of 5 :60 What happens when a neuron’s membrane depolarizes? • 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. 0 of 5 :60 A common feature of action potentials is that they: • 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. 0 of 5 :60 Where are neurotransmitter receptors located? • 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. 0 of 5 :60 Which of these correctly describes the distribution of ions in a resting neuron? • 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. 0 of 5 :60 The large intestine in humans: • 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 Endoskeleton Exoskeleton Molluscs and arthropods External Plates of chitin or CaCO3 • Sponges, echinoderms and invertebrates • Internal • Calcareous plates in Echinoderms • Bone, cartilage or both in vertebrates • Hydrostatic in other invertebrates

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

  12. 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

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

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