BIO 151 A&P 1 Exam 1 (GRADED A) Questions and Answers (New Update) Already GRADED A
This is a bundle of axons found in the peripheral nervous system.
... [Show More] The Nerves
This part of the autonomic system increases digestion. Para -sympathetic
This part of the autonomic system accelerates the heartbeat& increases breath rate. Sympathetic
The dorsal root of a nerve contains what type of neurons? Sensory- Afferent This part of a neuron conducts nerve impulses towards the cell body.
Dendrites
An efferent neuron carries information. From the central to the peripheral nervous system
An afferent neuron carries information: From the peripheral to the central nervous system
A postsynaptic neuron would be found After the synapse
This is a collection of cell bodies found in the peripheral nervous system Ganglia
At rest, a neuron plasma membrane is -70mV
An interneuron inside the spinal cord is part of the Central Nervous Sys
Which of the ff state is true concerning the neuromuscular junc- The NMJ terminates on a muscle fiber.
What neurotransmitter is found at neuromuscular junctions? Acetylcholine (ACh)
Which of the following is false concerning the sodium-potassium pump?The overall effect is a negative charge on the outside of the membrane.(False, the effect of the pump is a negative charge inside the membrane, positive on the outside.)
-True or False: Reflexes occur slower than a conscious decision to move from the brain.
-True or False: Reflexes occur only with conscious intervention from the brain.
-True or False: Action potentials travel in one direction within the same neuron.
-True or false: Neurons come into direct physical contact with one another. ( Neurons don’t physically
touch, they are separated by Synapses.)
-True or False: Neurons do not physically touch one another.
True or false: A sensory neuron is signaling the body of a light touch. This means that the strength of the action potential is weaker than usual.
Explain your reasoning. When a sensory neuron signals a light touch, the strength of the action potential is not weaker than usual. The strength of the action potential remains the same regardless of the intensity of the stimulus. The frequency of action potentials may vary depending on the intensity, but each individual action potential has the same strength. Hope that clears things up!
Describe the function and release of
Neurotransmitters are chemicals in our brain found in the axon terminal that help transmit signals between nerve cells. When a nerve impulse reaches the end of a neuron, it releases into the synapse, which is the small gap between neurons. These neurotransmitters then bind to receptors on the neighboring neuron, transmitting the signal.
What is the location and function of Satellite cells? Peripheral nervous system (PNS)
When muscles are damaged, satellite cells can become active and help repair and regenerate the muscle tissue.
What is the Location and fun of Astrocytes? Central Nervous sys.
Help regulate the chemical environment in the brain, and play a role in forming and maintaining the blood-brain barrier.
A patient’s spinal cord was severed in a car accident. Would the patient be expected to regrow axons in their spinal cord? Why or why not? No, it's difficult for the axons to regrow. The spinal cord is a complex structure, and the scar tissue that forms can block axon regrowth.
A patient's left thumb was severed in a cooking accident and then reattached during surgery. Would the patient be expected to regrow axons in their thumb? Why or why not? Yes, The nerves in the thumb can have the potential to regenerate and regrow axons to restore function.
Name and describe what is occurring in the neuron Cell membrane in section 4 of the diagram. Include the charge of the
membrane during this phase. Afterpolarization (Hyperpolarization) Potassium gates are slow to close and there is an undershoot of the potential. •The charge drops below -70mV and then returns to-70mV once at resting state again.
How is a message sent from one neuron to another? When one neuron wants to send a message to another neuron, it does so through a process called synaptic transmission. The sending neuron releases chemical messengers called neurotransmitters, which travel across a tiny gap called the synapse. These neurotransmitters then bind to receptors on the receiving neuron, allowing the message to be transmitted.
Multipolar [Show Less]