Physiology Lecture Quiz 6

Question 1

The __________ are extensions of the cell membrane (sarcolemma) that associate with the ends (terminal cisternae) of the sarcoplasmic reticulum.

Answer 1

T-tubles

Question 2

Which one is an accessory protein in the muscle?

Answer 2

Titin

Question 3

The ________ is the cytoplasm of the muscle cell.

Answer 3

Sarcoplasm

Question 4

The neural reflexes can be classified by all of the following, except;

Answer 4

Whether they are sensory or motor pathways.

or Conscious Control

Question 5

Which is false about Golgi tendon organs (GTO)?

Question 6

If blood vessels dilate, blood pressure decreases. T/F

Answer 6

True

Question 7

Which one is incorrect about Metarterioles?

Answer 7

They have the largest content of smooth muscle in their tunica media.

Question 8

The I band(inside of the muscle fiber) contains

Answer 8

only actin filaments

Question 9

The binding of acetylcholine to its receptor at the neuromuscular junction causes the opening of a WHAT?

Answer 9

chemically gated ion channel

Question 10

Asynchronous activation of motor units is important because its function is to avoid fatigue. T/F

Answer 10

True

Question 11

Identify the FALSE statement. (about reflexes)

Question 12

Which reflex is NOT controlled by the brain stem?

Answer 12

Patellar reflex

Question 13

The reflex that prevents damage from overstretching is the…WHICH ONE

Answer 13

myotatic (stretch) reflex

Question 14

Most reflex movements are integrated by WHAT?

Answer 14

spinal cord

Question 15

The structure whose abnormal function is associated with Parkinson’s disease is the________

Answer 15

substantia nigra

Question 16

Alpha motor neurons are associated with intrafusal muscle fibers. T/F

Answer 16

false

Question 17

The hepatic portal vein carries blood away from the…WHERE?

Answer 17

digestive organs and spleen

Question 18

Fainting is also known in medicine as___(TERM USED)__________.

Answer 18

syncope

Question 19

The inner lining of blood vessels is called___________.

Answer 19

endothelium

Question 20

The highly branched contractile cells that regulate capillary permeability are called__________.

Answer 20

pericytes

Question 21

Regarding the flexion reflex, what is the correct description?

Answer 21

withdrawal reflex initiated by a painful stimulus

Question 22

Spinal interneurons prevent muscle antagonists from interfering with an intended movement by WHAT?

Answer 22

reciprocal inhibition

or

initiating a stretch reflex

Question 23

After stretching an intrafusal fiber, the next event is …(WHAT HAPPENS NEXT)

Answer 23

increase afferent nerve firing

Question 24

The second phase in a SA node action potential occurs due to WHAT?

Answer 24

Calcium Ion influx

Question 25

The importance of the plateau phase of the action potential of myocardial cells is in..WHAT

Answer 25

Preventing tetanus

Question 26

The AV node is important because it…WHAT?

Answer 26

delays impulse between atria and ventricles

Question 27

The P wave of an ECG corresponds to…WHAT?

Answer 27

Atrial depolarization

Question 28

The QRS complex of an ECG represents WHAT?

Answer 28

Ventricular Depolarization

Question 29

The LUB heart sound occurs due to WHAT?

Answer 29

Closure of VA valves

Question 30

The volume of blood ejected from each ventricle during a contraction is called the____________

Answer 30

Stroke Volume

Question 31

Which of the following would increase peripheral resistance?

Answer 31

Increasing blood viscosity

Question 32

Angiogenesis is WHAT?

Answer 32

Formation of new blood vessels

Question 33

The sarcomere is the contractile unit of the myofibril. T/F

Answer 33

True

Question 34

Ventricular contraction begins___________.

Answer 34

after QRS complex

Question 35

Drugs known as calcium channel blockers (they don’t allow voltage-gated calcium channels from working) can be used to (WHAT)

Answer 35

decreases heart rate; dilate arteries

Question 36

A cardiologist is reviewing an ECG and notices an abnormality with the P wave, he concludes the patient is having a problem with _________

Answer 36

Atrial depolarization Issues

Question 37

The smooth muscle lacks troponin. T/F

Answer 37

True

Question 38

Which of the following chemicals is a vasoconstrictor? CHECK THE POWER POINT FOR A TABLE

Answer 38

Norepinephrine (α-receptors)

Serotonin

Endothelin

Vasopressin

Angiotensin II

Question 39

When the heart is in ventricular fibrillation,__(WHAT HAPPENS IN THE CARDIAC MUSCLE)_____________.

Answer 39

ineffective ventricle quivering

Question 40

The __________ contains the relay nuclei that modulate and pass messages to the cerebral cortex.

Answer 40

Thalamus