Lab final

Question 1

What does the myograph measure?

Answer 1

Mechanical physiological activity

Question 2

A cell that is myogenic

Answer 2

1. Is a muscle cell

2. Can contract without neural input

Question 3

Skeletal muscle contraction is modulated by the motor unit innervation. The motor unit consists of

Answer 3

1. Neuron
2. NMJ
3. Its associated muscle fibers

Question 4

If physostigmine works by blocking the AchE from degrading the Ach, why does adding it to the isolated smooth muscles increase contraction without adding Ach?

Answer 4

Ach is released from the myentric plexus

Question 5

Increasing the frequency of contraction induces motor unit summation (T/F)

Answer 5

False

Question 6

You apply a continual electrical stimulus to the sciatic nerve without detecting muscle contraction force from the gastrocnemius. The force of contraction is steadily decreasing, and after 10s you switch to a direct electrical stimulus. The force of contraction increases to 120% of the nerve-stimulated contraction force. What is likely the first site of fatigue?

Answer 6

Both, NMJ and the nerve. (Need more info to be specific)

Question 7

5 steps to calibrate Biopac?

Answer 7

1. Press scaling
2. Go to input channel scaling
3. Press cal 1
4. insert calibration weight
5. Press cal 2

Question 8

Which statements are true about tetany?

Answer 8

1. Max tension of nerve
2. Max tension of muscle
3. B and C
4. All

Question 9

When pinching nerve, what phenomenon causes the change on your record and what do you expect to see?

Answer 9

Na+ rushes in causing depolarization and an inflection in the record

Question 10

If the M receptors are being stimulated, which nervous system is being targeted?

Answer 10

Parasympathetic

Question 11

Where does animal matter get disposed of?

Answer 11

The morgue

Question 12

Cholingenic receptors respond to

Answer 12

ACh

Question 13

Biopac differs from the kymograph in that

Answer 13

It allows the recording of multiple physiological events simultaneously

Question 14

In neurophysiology, a motor neuron involves an effector, which causes a muscle in question to carry out contraction. In lab 2, which was the effector? The sciatic nerve or gastrocnemius muscle

Answer 14

Gastrocnemius muscle

Question 15

The major differences between skeletal and smooth muscle are

Answer 15

Smooth continuously depolarize in ryhthmic fasion.

NOT that they lack actin or myofilaments

Question 16

What information should be supplied in the journal section of the lab report?

Answer 16

1. Max minus min for each spike of interest, or represented as a data range
2. The voltage applied to the stimulator to achieve peak contractions

Question 17

In the smooth muscle lab, the addition of epi to the duodenum after the addition of atropine should do what?

Answer 17

cause a decrease in contraction

Question 18

4 myofilaments involved in the sliding theory?

Answer 18

1. Actin
2. Myosin
3. Myelin
4. topomyosin

Question 19

Which ion is responsible for muscle contractions within the muscle for ratcheting myosin heads?

Answer 19

Ca

Question 20

D-tubocurare affects muscle contraction because it

Answer 20

blocks nicotinic receptors

Question 21

Decreasing temperature affects muscle contraction how?

Answer 21

Decreasing both time and force of contraction

Question 22

Fatigue is defined as

Answer 22

transient and recoverable decline in muscle force due to repeated contractions

Question 23

The effect of lidocaine stems from its ability to affect the

Answer 23

membrane of the cells

Question 24

The addition of sodium azide to an isolated peice of smooth muscle will cause which of the following to occur?

Answer 24

All:

1. Increase in action potentials
2. Increase in contraction force
3. Eventual death of the tissue

Question 25

During normal skeletal muscle contraction, The direct stimulation of the muscle should always have ____ force when compared with the force when they are stimulated with max stimulus (single)

Answer 25

Equal

Question 26

When stimulating skeletal muscle, in order to show the multiple-unit summation, you must increase (frequency or force?)

Answer 26

Intensity

Question 27

You are exploring the properties of smooth-muscle working with an isolated muscle tissue. Which 2 drugs would cause

1. Initial increase in intensity/frequency
2. Even more increase?

Answer 27

Physostigmine, Ach