Wednesday, April 22, 2009

Sensory and Motor Mechanisms

Hello children of AP Biology-
Today both blocks went over the most recent packet (chapters 46 through 48 I believe). Then, B, I think you guys started chapter 50. Ms. Lyon decided she was done teaching C block shortly after the packet, so we did nothing else. I'm assuming chapter 50 is one of our last... ah the beginning of the end. I'm just going to give everyone a quick overview of it. Also, chapter 50 vocabulary quiz is tomorrow as I'm sure you knew. Meghan kindly posted all the words yesterday, so I'll just pick several for a short quiz at the end. STUDY UP!

Chapter 50: Sensory and Motor Mechanisms
section 50.1
-basically, your body has two parts to its nervous system: the PNS and CNS
-the PNS is the peripheral nervous system (everything but the brain and spinal column): sensory reception occurs in this system
-a sensory receptor (made of specialized neurons or epithelial cells) detect stimuli--either internal or ext
-the receptor converts the stimulus energy to a change in t
he membrane potential of that receptor (look back at the action potential graph)
-this stimulus signal is passed along through action po
tentials to the CNS: the central nervous system (consisting of your spinal column and brain)
-the brain now goes through a process called PERCEPTION: it understands what is happening (the sound, smell, etc.)
-the signal is amplified and then the receptor cell either produces action potentials or releases a neurotransmitter
-there are numerous types of chemoreceptors (detect solute concentrations), mechanoreceptors (pressure, touch, stretch, motion, sound), electromagnetic receptors (electromagnetic radiation), thermoreceptors (temperature), and pain receptors

Alright guys, there's a baby intro to chapter 50. Here is a quiz over a few of the words for the vocab quiz tomorrow.

1. The broad region that corresponds to the length of the thick filaments of microfibrils is __________.
a) Z Line
b) A Band
c) I Band

2. The photoreceptor in the vertebrate eye that detects color during the day is _________.
a) Cone Cell
b) Trypomyosin
c) Rod Cell

3. A type of mechanoreceptor that detects sound waves and other forms of movement in air and water is _________.
a) Rhodopsin
b) Thin Filament
c) Hair Cell

Answers: (1) B (2) A (3) C

Good luck on the quiz! 

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