Page 1 of 1: MCQ "2"

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Question 9. SMOOTH MUSCLE CELLS

(a) have single nuclei
True False

(b) use actin and myosin to develop contractile forces
True False

(c) are surrounded by an external lamina
True False

(d) have membrane receptors for hormones
True False

(e) may generate their own level of rhythmic contraction
True False

Question 10. IN A NEURON

(a) dendrites carry signals away from the cell body
True False

(b) there are few lysosomes
True False

(c) the smooth endoplasmic reticulum is termed Nissl substance
True False

(d) slow anterograde transport down the axon is mediated by microtubules
True False

(e) the terminal bouton is located at the end of the axon
True False

Question 11. IN A SYNAPSE

(a) synaptic vesicles are derived solely from transport down the axon
True False

(b) release of neurotransmitter is mediated by voltage-sensitive calcium channels in the nerve terminal
True False

(c) release of transmitter substance is via diffusion through the presynaptic membrane
True False

(d) the post synaptic membrane is fused to the presynaptic membrane by cell adhesion proteins
True False

(e) membrane from synaptic vesicles becomes transiently incorporated into the presynaptic membrane
True False

Question 12. MYELIN

(a) completely ensheathes myelinated axons throughout their length
True False

(b) is formed by Schwann cells in the central nervous system
True False

(c) may regenerate after damage in the peripheral nervous system
True False

(d) reduces the conduction speed in very large diameter axons
True False

(e) in the PNS has a different biochemical composition to that in the CNS
True False

Question 13. IN THE PERIPHERAL NERVOUS SYSTEM

(a) the perineurium surrounds a group of nerve fascicles
True False

(b) the epineurium is composed of flattened, epithelial-like cells
True False

(c) axons are all myelinated
True False

(d) nodes of Ranvier are areas of bare axon between segments of myelination
True False

(e) ganglia contain neuronal cell bodies, axons, Schwann cells and satellite cells
True False

Question 14. RED BLOOD CELLS

(a) have a biconcave shape which maximizes the surface/volume ratio for gas transfer in capillary vessels
True False

(b) have no mitochondria
True False

(c) have a membrane-associated cytoskeleton which maintains their shape
True False

(d) have a life span in peripheral blood of about 20 days
True False

(e) are removed, when aged, by cells in the spleen
True False

Question 15. WHITE BLOOD CELLS HAVE SPECIALIZED ROLES

(a) basophils emigrate into tissues and form plasma cells
True False

(b) monocytes emigrate into tissues and form macrophages
True False

(c) lymphocytes of certain types can secrete immunoglobulin
True False

(d) eosinophils are increased in number in the tissues and blood in allergic reactions
True False

(e) neutrophils have a long half-life of about 30 days once they are activated and have entered tissues
True False

Question 16. HEMOPOIESIS GENERATES ALL FORMS OF BLOOD CELL

(a) all blood cells derive from a common hemopoietic stem cell
True False

(b) both granulocytes and monocytes derive from a common committed progenitor cell
True False

(c) each of the cytokines which control and modulate hemopoiesis act very specifically on one cell line
True False

(d) platelets are formed from myeloid cells
True False

(e) committed progenitor cells are not self-receiving
True False

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