Physiology Lecture Quiz 6 Flashcards
The __________ are extensions of the cell membrane (sarcolemma) that associate with the ends (terminal cisternae) of the sarcoplasmic reticulum.
T-tubles
Which one is an accessory protein in the muscle?
Titin
The ________ is the cytoplasm of the muscle cell.
Sarcoplasm
The neural reflexes can be classified by all of the following, except;
Whether they are sensory or motor pathways.
or Conscious Control
Which is false about Golgi tendon organs (GTO)?
If blood vessels dilate, blood pressure decreases. T/F
True
Which one is incorrect about Metarterioles?
They have the largest content of smooth muscle in their tunica media.
The I band(inside of the muscle fiber) contains
only actin filaments
The binding of acetylcholine to its receptor at the neuromuscular junction causes the opening of a WHAT?
chemically gated ion channel
Asynchronous activation of motor units is important because its function is to avoid fatigue. T/F
True
Identify the FALSE statement. (about reflexes)
Which reflex is NOT controlled by the brain stem?
Patellar reflex
The reflex that prevents damage from overstretching is the…WHICH ONE
myotatic (stretch) reflex
Most reflex movements are integrated by WHAT?
spinal cord
The structure whose abnormal function is associated with Parkinson’s disease is the________
substantia nigra
Alpha motor neurons are associated with intrafusal muscle fibers. T/F
false
The hepatic portal vein carries blood away from the…WHERE?
digestive organs and spleen
Fainting is also known in medicine as___(TERM USED)__________.
syncope
The inner lining of blood vessels is called___________.
endothelium
The highly branched contractile cells that regulate capillary permeability are called__________.
pericytes
Regarding the flexion reflex, what is the correct description?
withdrawal reflex initiated by a painful stimulus
Spinal interneurons prevent muscle antagonists from interfering with an intended movement by WHAT?
reciprocal inhibition
or
initiating a stretch reflex
After stretching an intrafusal fiber, the next event is …(WHAT HAPPENS NEXT)
increase afferent nerve firing
The second phase in a SA node action potential occurs due to WHAT?
Calcium Ion influx
The importance of the plateau phase of the action potential of myocardial cells is in..WHAT
Preventing tetanus
The AV node is important because it…WHAT?
delays impulse between atria and ventricles
The P wave of an ECG corresponds to…WHAT?
Atrial depolarization
The QRS complex of an ECG represents WHAT?
Ventricular Depolarization
The LUB heart sound occurs due to WHAT?
Closure of VA valves
The volume of blood ejected from each ventricle during a contraction is called the____________
Stroke Volume
Which of the following would increase peripheral resistance?
Increasing blood viscosity
Angiogenesis is WHAT?
Formation of new blood vessels
The sarcomere is the contractile unit of the myofibril. T/F
True
Ventricular contraction begins___________.
after QRS complex
Drugs known as calcium channel blockers (they don’t allow voltage-gated calcium channels from working) can be used to (WHAT)
decreases heart rate; dilate arteries
A cardiologist is reviewing an ECG and notices an abnormality with the P wave, he concludes the patient is having a problem with _________
Atrial depolarization Issues
The smooth muscle lacks troponin. T/F
True
Which of the following chemicals is a vasoconstrictor? CHECK THE POWER POINT FOR A TABLE
Norepinephrine (α-receptors)
Serotonin
Endothelin
Vasopressin
Angiotensin II
When the heart is in ventricular fibrillation,__(WHAT HAPPENS IN THE CARDIAC MUSCLE)_____________.
ineffective ventricle quivering
The __________ contains the relay nuclei that modulate and pass messages to the cerebral cortex.
Thalamus
