List the players (cells) involved in a reflex arc and describe the function of each
What will be an ideal response?
When a sensory neuron is stimulated, the impulse travels to the spinal cord, and in most cases to the brain as well. Reflexes may result in movement of voluntary, involuntary, or cardiac muscles. The sympathetic system typically involves speeding up processes; the parasympathetic returns the body to homeostasis. The free nerve ending that begins this process is located in the skin or organ in question; the cyton is in the dorsal root ganglion. The dendrite then makes a synapse in the spinal cord or brain, and ultimately the motor neuron exits via the ventral root. The cyton for this neuron is located in the brain or spinal cord, so the cellular extension that goes out to the effector is the motor axon.
You might also like to view...
Which of the following steps is the third step of the mating-type switch mechanism?
A. A 3' single-stranded overhang is created. B. The MAT locus is cleaved by a specific nuclease to create a double-stranded break. C. Strand invasion of HMLa or HML? is mediated by Rad51. D. As the 3' invading end is extended by DNA polymerase, the HML locus information is copied, whereas the MAT gene information is degraded. E. When the extension has proceeded far enough, it dissociates and reanneals to its original strand.
Birds differ from earlier vertebrates by ____
a. the presence of feathers b. producing land eggs c. the ability to maintain a constant body temperature through metabolic activities d. the ability to fertilize eggs internally e. their possession of a dorsal nerve cord
Any source of information can be used to evaluate a scientific theory
1.True 2.False
Why do populations farther from Africa have more deleterious mutations in their genome?
A. Repeated bottlenecks and founder effects made genetic drift more intense more often. B. Populations farther from Africa have been exposed to more mutagens in the environment. C. Those populations have experienced more intense natural selection, so more deleterious alleles increased in frequency by genetic hitchhiking. D. As people migrated over the globe they interbred with Neanderthals and Denisovans. E. The populations are younger, so purifying selection has not had time to purge deleterious mutations from the populations.