During an experiment the myotatic reflex has been studied in frogs. After extension in a skeletal



Muscle its reflectory contraction was absent. The reason for it might be a dysfunction of the

Following receptors:

A Muscle spindles

B Nociceptors

C Articular

D Golgi tendon organs

E Tactile

      127

Vagus branches that innervate heart are being stimulated in course of an experiment. As a

Result of it the excitement conduction from atria to the ventricles was brought to a stop. It is

Caused by electrophysical changes in the following structures:

A Atrioventricular node

B His' bundle

C Sinoatrial node

D Ventricles

E Atria

      128

If a man has an attack of bronchiospasm it is necessary to reduce the effect of vagus on

Smooth muscles of bronchi. What membrane cytoreceptors should be blocked for this purpose?

A M-cholinoreceptors

B N-cholinoreceptors

C α -adrenoreceptors

D β -adrenoreceptors

E α - and β -adrenoreceptors

      129

When water affects mucous membrane of the inferior nasal meatuses, this causes "diver

reflex" that provokes:

A Reflectory apnea

B Reflectrory dyspnea

C Reflectory hyperpnea

D Cough

E Bronchospasm

      130

A man weighs 80 kg, after long physical activity his circulating blood volume is reduced down to

5,4 l, hematocrit makes up 50%, whole blood protein is 80 g/l. These blood characteristics are

Determined first of all by:

A Water loss with sweat

B Increased number of erythrocytes

C Increased protein concentration in plasm

D Increased circulating blood volume

E Increased diuresis

      131

A 16 year old boy after an illness has diminished function of protein synthesis in liver as a result

Of vitamin K deficiency. It will cause disturbance of:

A Blood coagulation

B Erythrocyte sedimentation rate

C Anticoagulant generation

D Erythropoietin secretion

E Osmotic blood pressure

      132

In response to a change in body position from horizontal to vertical blood circulation system

Develops reflectory pressor reaction. Which of the following is its compulsory component?

A Systemic constriction of the venous vessels

B Systemic dilatation of the arterial resistive vessels

C Decrease in the circulating blood volume

D Increase in the heart rate

E Weakening of the pumbing ability of heart

      133

Examination of a pregnant woman revealed twice as much concentration of fibrinogen in blood

Plasm. What ESR can this woman have?

A 40-50 mm/h

B 10-15 mm/h

C 2-12 mm/h

D 5-10 mm/h

E 0-5 mm/h

      134

Introduction of a big dose of histamine to an experimental animal caused abrupt drop of arterial

Pressure as a result of:

A Dilatation of resistance vessels

B Constriction of resistance vessels

C Increase of heart rate

D Decrease of heart rate

E Decrease of heart rate and force

      135

Systemic arterial pressure of an adult dropped from 120/70 to 90/50 mm Hg that led to

Reflectory vasoconstriction. The vasoconstriction will be maximal in the following organ:

A Bowels

B Heart

C Brain

D Kidneys

E Adrenals

      136

Microelectrode technique allowed to register a potential following "all-or-none" law and being

Able of undecremental spreading. Specify this potential:

A Action potential

B Excitatory postsynaptic potential

C Rest potential

D Inhibitory postsynaptic potential

E Receptor potential

      137

Vagus branches that innervate heart are being stimulated during an experiment. This caused

Reduction of heart rate due to the intensification of the following process (through the cell

Membrane of cardiac pacemaker):

A Potassium ion yield

B Potassium ion entry

C Calcium ion entry

D Calcium ion yield

E Calcium and potassium ion yield

      138

Rest potential of a cell equals -80 mV. At what stage of action potential did the membrane

potential equal +30 mV?

A Reverse polarization

B After hyperpolarization

C After depolarization

D Depolarization

E -

      139

A 35 year old man got an injury that caused complete disruption of spinal cord at the level of the

First cervical segment. What respiration changes will be observed?

A It will come to a standstill

B No changes will be observed

C Diaphragmal respiration will be maintained, thoracic respiration will disappear

D Thoracic respiration will be maintained, diaphragmal respiration will disappear

E It will become infrequent and deep

      140


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