Medical Physiology Mid-Semester Exam — 2020 (Past Paper)

Question 1

Incorrect Mark 0.00 out of 1.00 Nitric oxide produces many of its physiologic effects by stimulating the synthesis of ---

Accepted Answer

Cyclic GMP

Question 2

Correct Mark 1.00 out of 1.00 Parasympathetic tone is mostly responsible for ---

Accepted Answer

Maintenance of the systemic arterial blood pressure.

Question 3

Correct Mark 1.00 out of 1.00 Skeletal muscle is described by all of the following EXCEPT ---

Accepted Answer

autorhythmic

Question 4

Incorrect Mark 0.00 out of 1.00 Sympathetic tone serves the following autonomic functions ---

Accepted Answer

Maintenance of normal arterial blood pressure.

Question 5

Correct Mark 1.00 out of 1.00 All of the following ascending sensory pathways are located in the dorsal column EXCEPT ---

Accepted Answer

touch

Question 6

Correct Mark 1.00 out of 1.00 It is correct to say ---

Accepted Answer

Tropomysion covers the active sites of actin.

Question 7

Correct Mark 1.00 out of 1.00 Integration of the autonomic functions involves the following higher centres except ---

Accepted Answer

Limbic system.

Question 8

Incorrect Mark 0.00 out of 1.00 when comparing the contractile responses in smooth and skeletal muscle, which of the following is most different? ---

Accepted Answer

The role of calcium in initiating contraction.

Question 9

Incorrect Mark 0.00 out of 1.00 Cerebellum receives input from the following sites EXCEPT ---

Accepted Answer

All of the above

Question 10

Correct Mark 1.00 out of 1.00 Which of the following structures is a component of reflex arc? ---

Accepted Answer

Effector organ.

Question 11

Incorrect Mark 0.00 out of 1.00 Sensory systems code for the following attributes of a stimulus: B. C. D. E. ---

Accepted Answer

threshold, receptive field, adaptation, and discrimination

Question 12

Correct Mark 1.00 out of 1.00 About acetylcholine, all the following statements are true except ---

Accepted Answer

It is liberated by all parasympathetic. nerve fibres.

Question 13

Incorrect Mark 0.00 out of 1.00 Sensations can occur only ---

Accepted Answer

within the afferent neuron.

Question 14

Incorrect Mark 0.00 out of 1.00 Effector organs of the ANS include all of the following EXCEPT ---

Accepted Answer

Medulla oblongata.

Question 15

Correct Mark 1.00 out of 1.00 A small motor unit would control which type of movement? ---

Accepted Answer

delicate and precise

Question 16

Correct Mark 1.00 out of 1.00 Damage to cutaneous receptors would limit the ability to detect all of the following except . ---

Accepted Answer

thermal sensations.

Question 17

Correct Mark 1.00 out of 1.00 Red ( slow ) fibers are characterized by the following except ---

Accepted Answer

contains high concentration of myoglobin.

Question 18

Correct Mark 1.00 out of 1.00 These bands of the sarcomere do not shorten during contraction ---

Accepted Answer

Z discs and A bands

Question 19

Incorrect Mark 0.00 out of 1.00 What is NOT an effect of the Parasympathetic Nervous System? ---

Accepted Answer

speed up reproductive system

Question 20

Correct Mark 1.00 out of 1.00 The following statement is FALSE about the cells arising from the common lymphoid progenitor ---

Accepted Answer

Innate lymphoid cells lack antigen specific receptors of the adaptive immune system

Question 21

Incorrect Mark 0.00 out of 1.00 A receptor potential ---

Accepted Answer

is unchanged when a given stimulus is applied repeatedly over time.

Question 22

Correct Mark 1.00 out of 1.00 As regard neuro-muscular transmission all are true except ---

Accepted Answer

it is an efficient form of synaptic transmission

Question 23

Correct Mark 1.00 out of 1.00 45\. Smooth muscles differ from skeletal and cardiac muscles in that they . ---

Accepted Answer

Lack myofibrils

Question 24

Incorrect Mark 0.00 out of 1.00 Noradrenaline (norepinephrine) ---

Accepted Answer

Is liberated by the sympathetic. Preganglionic. Fibers that supply the adrenal medulla .

Question 25

Correct Mark 1.00 out of 1.00 41\. During muscle contraction ---

Accepted Answer

Z-lines move further apart

Question 26

Regarding corticospinal (corticobulbar) tract: . ---

Accepted Answer

None of the above .

Question 27

Smooth muscle contractions ---

Accepted Answer

are exaggerated in vitro when bathed in acelylcholine

Question 28

Correct Mark 1.00 out of 1.00 The efferent pathway of the ANS generally contains ..... neuron(s). ---

Accepted Answer

None of the above

Question 29

Incorrect Mark 0.00 out of 1.00 The major difference between the autonomic & somatic divisions of the nervous system is ---

Accepted Answer

The somatic nerves only originate from the thoraco-lumbar segments of the spinal cord.

Question 30

Correct Mark 1.00 out of 1.00 The function of tropomyosin in skeletal muscle include ---

Accepted Answer

binding to myosin during contraction

Question 31

Correct Mark 1.00 out of 1.00 The system that controls smooth muscle, cardiac muscle, and gland activity is the ---

Accepted Answer

Skeletal division.

Question 32

Incorrect Mark 0.00 out of 1.00 It is true to say that nicotine in small dose has an excitatory influence on the ---

Accepted Answer

Beta adrenergic receptors.

Question 33

Incorrect Mark 0.00 out of 1.00 Intrafusal fibres ---

Accepted Answer

is innervated by alpha motor neurone

Question 34

Incorrect Mark 0.00 out of 1.00 General sensations ---

Accepted Answer

are mediated by somatic sensory fibers only

Question 35

Correct Mark 1.00 out of 1.00 The resting potential of most cells is most dependent on the transmembrane concentration gradient of ---

Accepted Answer

Chloride

Question 36

Correct Mark 1.00 out of 1.00 Which of the following properties does cardiac muscle share with smooth muscle? ---

Accepted Answer

Z-disks

Question 37

Correct Mark 1.00 out of 1.00 The role of transverse tubules in skeletal muscle fibers is to ---

Accepted Answer

connect the sarcolemma to the sarcoplasmic reticulum (SR)

Question 38

Correct Mark 1.00 out of 1.00 Motor systems in humans include all of the following EXCEPT ---

Accepted Answer

None of the above

Question 39

Correct Mark 1.00 out of 1.00 The autonomic ganglia ---

Accepted Answer

Function as distributing centres.

Question 40

Incorrect Mark 0.00 out of 1.00 The parasympathetic nerves ---

Accepted Answer

Are catabolic in their actions.

Question 41

Correct Mark 1.00 out of 1.00 Which of these characteristics is not related to the Parasympathetic division of the ANS? ---

Accepted Answer

Defecation

Question 42

Incorrect Mark 0.00 out of 1.00 The following disorder involves deficiency of a mitochondrial myophosphorylase ---

Accepted Answer

Fabry's ' disease

Question 43

Correct Mark 1.00 out of 1.00 Excitation contraction coupling involves all the following except ---

Accepted Answer

release of Calcium from sarcoplamsic reticulum

Question 44

Correct Mark 1.00 out of 1.00 A modular body which contains large numbers of neuronal cell bodies and is located within the peripheral nervous system is called a ---

Accepted Answer

Ganglion.

Question 45

Correct Mark 1.00 out of 1.00 Regarding the thalamus... ---

Accepted Answer

All the above.

Question 46

Correct Mark 1.00 out of 1.00 During skeletal muscle contraction, Which of the following statements is NOT true ---

Accepted Answer

ATP is required for successive actin--myosin interactions.

Question 47

Correct Mark 1.00 out of 1.00 Type 2 muscle fibers ---

Accepted Answer

contain low concentrations of myoglobin.

Question 48

Correct Mark 1.00 out of 1.00 When a skeletal muscle contracts ---

Accepted Answer

it does so at a mechanical efficiency of 80%

Question 49

Incorrect Mark 0.00 out of 1.00 The Contraction in smooth muscle differs from that of skeletal muscle ---

Accepted Answer

Unable to maintain same duration of contraction

Question 50

Incorrect Mark 0.00 out of 1.00 23- Muscle fatigue is due to ---

Accepted Answer

Failure of neuro-muscular transmission.

Medical Physiology Mid-Semester Exam — 2020 (Past Paper)

Questions, Answers & Explanations