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Physiology 'mini' examination

Attempt all questions.  Check the box next to the answers that you believe to be true.  Leave unchecked all answers that you believe to be false.  Once you have completed each question it can be marked.  One point is scored for a correct answer.  Incorrect answers score zero.  There is no negative marking.  The answers to each question can then be explained.  You can not change the answers after they have been marked!

1. Parathyroid hormone (PTH)
(a) Is a 184 amino acid peptide hormone
(b) Acts on a cell surface receptor that increases intracellular cyclic AMP
(c) Increases calcium release from bone
(d) Increases production of 1,25 dihydroxy-vitamin D3 in the kidney
(e) Reduces calcium absorption from the gastrointestinal tract

        

2. Anti-diuretic diuretic hormone (ADH)
(a) Is produced by the anterior lobe of the pituitary gland
(b) Is released by neurosecretion
(c) Serum levels are increased by a low plasma osmolality
(d) Secretion is increased in the early post-operative period
(e) Acts by increasing the permeability of the distal convoluted tubule

        

3. Regarding the sensory dermatomes
(a) C3 and C4 supply the tip of the shoulder
(b) L1 supplies the umbilicus
(c) L4 and L5 supply the sole of the foot
(d) Sacral nerves supply the perianal skin
(e) The facial nerve supplies the face

        

4. The sympathetic nervous system
(a) Produces pupillary dilatation
(b) Reduces gastrointestinal motility
(c) Constricts bronchiole smooth muscle
(d) Constricts skin and mucous membrane blood vessels
(e) Contracts the bladder detrusor muscle

        

5. Cerebrospinal fluid
(a) Has a composition almost identical to that of the brain extracellular fluid
(b) Is produced by the choroid plexus
(c) Circulates from the subarachnoid space into the cerebral ventricles
(d) Is absorbed through the arachnoid villi
(e) Absorption is independent of intraventricular pressure

        

6. Smooth muscle cells
(a) Microscopically have a striated appearance
(b) Do not possess actin and myosin
(c) Show spontaneous muscle contraction
(d) Adjacent cells are electrically coupled
(e) Are controlled by the autonomic nervous system

        

7. Regarding pain sensation
(a) It arises by stimulation of free nerve endings
(b) Is transmitted to the central nervous system by myelinated A fibres
(c) Central transmission occurs via the spinothalamic tracts
(d) The thalamus is important in the perception of pain
(e) Can be reduced by local anaesthetics that reduce potassium influx into nerve fibres

        

8. Following a total gastrectomy
(a) Anaemia can occur due to iron deficiency
(b) Anaemia can occur due to B12 deficiency
(c) Protein digestion is significantly impaired
(d) Diarrhoea is a frequent complaint
(e) Fainting and collapse may occur after a meal

        

9. Haemorrhage in man
(a) Produces venoconstriction
(b) Produces widespread arteriolar dilatation
(c) Produces a fall in cardiac output
(d) Causes splenic contraction
(e) Increases aldosterone secretion

        

10. The prothrombin time
(a) Assesses the intrinsic pathway of the blood coagulation system
(b) Can be prolonged in jaundiced patients
(c) Is increased by warfarin
(d) Is increased by heparin
(e) Can be restored to normal by the administration of protamine

        

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Authored in CALnet

 
 

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