Essentials of Human Anatomy and Physiology(11) Activity Lab 7 – Flashcards

The small space between the sending neuron and the receiving neuron is the synaptic cleft. synaptic terminal. calcium channel. neurotransmitter. vesicle.

A molecule that carries information across a synaptic cleft is a sending neuron. neurotransmitter. synaptic cleft. synapse. receiving neuron.

When calcium ions enter the synaptic terminal, neurotransmitter molecules are quickly removed from the synaptic cleft. they cause an action potential in the sending neuron. the inside of the receiving neuron becomes more negative. they cause vesicles containing neurotransmitter molecules to fuse to the plasma membrane of the sending neuron. the inside of the receiving neuron becomes more positive

When neurotransmitter molecules bind to receptors in the plasma membrane of the receiving neuron, the receiving neuron becomes more negative inside. ion channels in the plasma membrane of the receiving neuron open. vesicles in the synaptic terminal fuse to the plasma membrane of the sending neuron. ion channels in the plasma membrane of the sending neuron open. the receiving neuron becomes more positive inside.

If a signal from a sending neuron makes the receiving neuron more negative inside, the sending neuron becomes more positive inside. the receiving neuron immediately generates an action potential. the receiving neuron is less likely to generate an action potential. the receiving neuron is more likely to generate an action potential. the sending neuron becomes more negative inside.

You are working on a new medication to selectively kill cancer cells. You test the drug on a culture of normal neurons to check for any side effects. Despite the presence of the drug, a normal resting membrane potential of ?70 mV is maintained. Look at each of the figures below to analyze how the drug might be affecting the neuron. Figure A shows neuron activity under normal, or control, conditions (without the drug). Figure B shows neuron activity that has been altered due to exposure to the drug. Based on these results, the drug is most likely __________. destroying some of the Na+ leak channels destroying some of the K+ leak channels preventing Na+-gated channels from opening opening voltage-gated K+ channels

The concentrations of which two ions are highest outside the cell? K+ and Cl? Na+ and Cl? K+ and protein anions (A?) Na+ and protein anions (A?)

Let's consider a scenario in which the resting membrane potential changes from ?70 mV to +70 mV, but the concentrations of all ions in the intracellular and extracellular fluids are unchanged. Predict how this change in membrane potential affects the movement of Na+. The electrical gradient for Na+ would tend to move Na+ __________ while the chemical gradient for Na+ would tend to move Na+ __________. out; in in; in out; out in; out

Part E

Physicians can use simple reflex tests to monitor the CNS. When reflex tests are abnormal, more sophisticated neurological tests may be ordered to try to localize and identify the problem. What is an electroencephalogram (EEG)? Select the best answer. It is a tool that measures the patterns of electrical activity of the neurons in the brain. It is a scan using magnetic fields and radio waves to produce images of the body. It is a special X-ray to monitor blood flow in the brain. It is a nuclear medicine scan that gives a three-dimensional image.

To measure the electrical activity of brain neurons, electrodes are placed at various points on the scalp and connected to a recording device. The patterns of electrical activity of the neurons are called brain waves. Brain waves are unique and can be used to diagnose disorders in the brain.

Contusions and concussions are both brain injuries but display different symptoms. Fill in the blank with the injury that correctly completes the statement.

Spinal nerves are _____ nerves. mixed sensory motor

Why is white matter "white"? Endoneurium is composed of a delicate connective tissue. The region contains a high concentration of the white pigment titanium dioxide. It contains a high concentration of myelin. It consists of cell bodies and unmyelinated fibers.

Which of the following can adversely affect brain development? alcohol aspirin exercise folic acid