physio 15

1.

1 point

1- The conductive system of the heart is made of all of these except for :

Purkinje fibers

Sinus node

Muscles

Bundles

2.

1 point

2- The fastest action potential happens in :

* The skeletal muscles

* The cardiac muscles

* The smooth muscles

* All have the same speed

3.

1 point

3- The action potential of the heart :

* Is same as the potential in the skeletal muscles

* Is initiated in the AV node

* Is initiated in the sinus node

* Two answers are correct

4.

1 point

4- Why does the action potential spread fast between the cells of the ventricle of the heart ?

* Because of the high permeability

* Because they are continuous with the SA node

* Because they contract as one unit

* All of the above

5.

1 point

5- What leads to high permeability between heart cells ?

* Gap junctions

* Tight junctions

* Contracting as one unit

* All of the above

6.

1 point

6- Cadherin and catenin proteins allow the transmission of :

* Action potential

* Na+ ions

* ATP

* Non of the above

7.

1 point

7- The entrance of potassium ions is called :

* Overshoot

* Depolarization

* Repolarization

hyperpolarization

8.

1 point

8- Which of these happen primarily because of slow calcium voltage-gated channels ?

* Depolarization

* Repolarization

* Plateau

* All of the above

9.

1 point

9- Which statement is true ?

* the ventricle will have 100% of the atrium’s blood after contraction

* atrial fibrillation causes death

* 75% of the blood flows from atriums to the ventricle by contraction

* 25% of the blood flows from atriums to the ventricle spontaneously

10.

1 point

10- all of these statements are true except :

* sodium potassium pump and leak channels cause negative resting membrane

* atriums are called primer pumps

* negatively charged high molecular weight proteins cause negative resting membrane potential

* all fibrillations in heart are lethal

11.

1 point

11- T wave represent :

* Ventricle depolarization

* Ventricle repolarization

* Atrium depolarization

* Atrium repolarization + ventricle repolarization

12.

1 point

12- Which of these statements isn’t true :

* The motor division sends info to effectors

* The somatic motor is voluntary and innervates skeletal muscles

* The peripheral part of the nervous system is divided into sensory and motor

* The acetylcholine is the neurotransmitter of the sympathetic part

13.

1 point

13- All of these are true except :

- visceral organs are controlled by autonomic motor

* Enteric is responsible for innervation of the GIT

* origin of sympathetic nerves is from T1-L2 in the spinal cord

* Sympathetic system innervates ventricles and mainly the right one

14.

1 point

14- Which of these isn’t true :

* If the heart rate is bellow 60 is called bradycardia while above 60 is called tachycardia

* More blood is pumped to brain in case of sympathetic affect

* Normal heart rate is between 60 and 100

* Stroke volume = cardiac output / heart rate