BDS1 Biomedical Sciences Qs 2017 Flashcards
Which one of the following is a unique sympathetic function?
a. regulation of blood flow to the GI tract
b. regulation of body temperature
c. regulation of cardiac rate
d. regulation of pupil size
e. regulation of respiratory rate
b: regulation of body temperature
Which of the following statements about glycogenolysis and glucose metabolism is TRUE?
a. Glucose-6-phosphate from liver glycogen usually enters glycolysis
b. Glucose-6-phosphate from muscle glycogen sometimes enters the blood
c. Muscle cytosol contains glucose-6-phosphatase
d. Liver glycogenolysis and glycolysis are not usually active at the same time
e. Muscle glycolysis is inhibited by epinephrine
d. Liver glycogenolysis and glycolysis are not usually active at the same time
Medium chain acyl CoA (MCAD) deficiency results in:
a. Increased blood glucose following a meal
b. Increased ketone body synthesis during a fast
c. Decreased levels of liver ATP during a fast
d. Increased gluconeogenesis during a fast
e. Increase ketone body synthesis following a meal
c. Decreased levels of liver ATP during a fast
In contrast to the somatic nervous system, the autonomic nervous system ________.
a. has both afferent and efferent fibre
b. has two efferent neurons
c. has two afferent neurons
d. is not controlled by the central nervous system (CNS)
e. stimulates its effector cells
b. has two efferent neurons
Sympathetic nerves may leave the spinal cord at which vertebrae?
a. first coccyx
b. first lumbar
c. first thoracic
d. second cervical
e. third lumbar
c. first thoracic
Which one of the following best describes properties of Beta-blockers?
a. are potent antidepressants
b. attack mainly to the B1 receptors of cardiac muscle
c. have widespread sympathetic effects
d. increase a dangerously low heart rate
e. relax muscles of airways
b. attack mainly to the B1 receptors of cardiac muscle
A pronounced internal elastic membrane and external elastic membrane are distinguishing characteristics of which type of vessel?
a: arteriole
b: capillary
c: elastic artery
d: muscular artery
e: venule
d: muscular artery
Phosphofructokinase, the major flux-controlling enzyme of glycolysis is allosterically inhibited by \_\_\_ and activated by \_\_\_. a. AMP Pi b. ADP AMP c. ATP ADP d. ATP PEP e. citrate ATP
c. ATP ADP
Autonomic ganglia contain which of the following?
a. an outer connective tissue capsule around the cell bodies of preganglionic motor
neurons
b. both somatic afferent and efferent neurons
c. cell bodies in the ventral horn of the spinal cord
d. cell bodies of motor neurons
e. synapses between postganglionic fibres and their effectors
d. cell bodies of motor neurons
Which of the following statements concerning cardiac muscle is correct?
a. All of the Ca2+required for contraction enters a myocyte during the plateau phase of the action potential
b. Heart muscle contracts in response to action potentials in the autonomic nerve fibres
c. The action potential has the same duration as that of skeletal muscle
d. The force of contraction is increased by circulating adrenaline
e. Unlike skeletal muscle troponin is not involved in cardiac muscle contraction
d. The force of contraction is increased by circulating adrenaline
Plasma proteins are not involved in which one of the following processes?
a. Blood clotting
b. Blood viscosity
c. Plasma colloid osmotic pressure
d. Transport of oxygen
e. Transport of hormones
d. Transport of oxygen
White blood cells with receptors for IgE on their membranes are:
a. Basophils
b. Eosinophils
c. Lymphocytes
d. Monocytes
e. Neutrophils
a. Basophils
The muscle protein which covers active sites on actin filaments at rest is:
a. Actinin
b. Myosin
c. Tropomyosin
d. Tropinin-T
e. Titin
c. Tropomyosin
Contraction of the gall bladder and stimulation of enzyme rich pancreatic secretion are the function of which one of the following? a. Cholecystokinin b. Gastrin c. Motilin d. Secretin e. Vasoactive intestinal peptise
a. Cholecystokinin
Vagal stimulation results in slowing of heart rate. This is due to increased permeability of
the sinoatrial nodal fibre membrane to which one the following?
a. Calcium
b. Chloride
c. Potassium
d. Sodium
e. Sodium and calcium
c. Potassium