Consider the following tibial nerve conduction velocity (NCV) test results below. A unique feature of distal limb motor neurons is that the axons taper abruptly in the lower extremities. What is the best explanation for why these average NCVs are decreasing with increasing height? Height (in) Mean NCV (m/s) < 5’3” 51 5’3” – 5’7” 49 > 5’7” 47  

A patient was brought into the University Hospital Emergency Department due to an accident. When the patient has an MRI scan there are abnormal findings in the frontal lobe. The patient is experiencing confusion, slurred speech, and problems trying to make voluntary muscle movements. Complete the pathway to understand why this accident is affecting motor function. Damage in the interferes with signals to the that innervate the and ultimately the , affecting voluntary muscle responses.

You have just discovered an unusual new species that has neurons with a resting membrane potential of +50 mV! It seems to accomplish this with only Na+/K+ pumps, Na+ Leak channels and K+ Leak channels in the cell membrane. The ion concentrations inside and outside of the cell are at typical values for a mammalian neuron. Which of these could explain the positive resting membrane potential? 

Ions flowing across a neuronal membrane always reach equilibrium at a point where the concentration of that ion is equal on both sides of the membrane. 

A 46 year old patient has a deciduous mandibular left canine. Her dentition is would be classified as ______________ dentition.

Permanent mandibular first molars typically erupt before permanent central incisors.

Permanent maxillary first molars typically erupt before permanent mandibular first molars.

Here is a typical action potential from a neuron that you are recording in lab:    Your lab partner applies a drug to that neuron. According to the label, it completely blocks all functions for one specific protein, but the label is damaged and doesn’t say which protein. The next action potential you record looks like this: Which of the following proteins has been targeted by the drug?

The nurse in an emergency department is helping triage victims of an explosion. Rank, in order from 1 to 5, the following patients according to their need for priority treatment according to disaster response protocols and mass casualty event triage. 1. A 15-year-old with a laceration to the foot that is bleeding slightly2. A 36-year-old who has no pulse or respirations and has an open head injury3. A 62-year-old with a distended abdomen who reports severe abdominal pain4. A 5-year-old with a suspected fracture of the humerus5. A 58-year-old woman with a full-thickness burn to the bilateral lower extremities

Permanent teeth begin to calcify at birth.