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BHCS1002 2022/2023
2019/2020
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hannah mcvicker
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Cards (50)
What type of modality of stimulus does the somatosensory system respond to?
All of the
above
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Which statement is FALSE about mammalian low threshold primary sensory neurons?
They have
cell bodies
in the
spinal cord
ventral horn
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What are the functions of the diencephalon?
Initiates
motor control paradigms
Regulates posture and balance
Locus of sensory integration prior to the
thalamus
Integrates activities of the
autonomic nervous system
Autonomic centre for regulation of visceral function
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What is the adequate stimulus for proprioceptors?
Muscle tension
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What occurs during temporal summation in a postsynaptic neuron?
Several
EPSPs
from a single
presynaptic input
sum over time to reach threshold
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What partially contributes to the membrane potential of any living cell?
A membrane that is leaky to
potassium conductance
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Which statement is TRUE for both active and facilitated diffusion?
Both are
bidirectional
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Which statement is FALSE about the cell membrane?
It is made up of a
phospholipid monolayer
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Which statement is FALSE about mitochondrion of a cell?
All cells have
equal
number of mitochondrion but the size may vary from cell to cell
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Which statement is TRUE about lysosomes?
They are formed by breaking off from the
Golgi
bodies
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Which organelle produces microtubules?
Centrosome
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What are the microfilaments of the cytoskeletal network of human cells made of?
Actin
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What are the normal ranges for white blood cells in a normal person?
Total white blood cell count: 4 – 11 x
10^6
/ml
Eosinophils: 1 – 4 x
10^9
/L
Lymphocytes: 1.5 – 3.5 x
10^12
/L
Monocytes
: 7 – 15% of
total white blood cell count
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Which component constitutes about 43% of the blood volume?
Erythrocytes
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What is essential for the arrest of bleeding?
All of the
above
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Which cell type carries a memory of previously encountered antigen?
Lymphocytes
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Where does the cardiac conduction sequence start?
Sino-atrial node
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Which of the following is NOT part of the mechanical events in the cardiac cycle?
Dichrotic notch
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Which layer in a blood vessel contains most smooth muscle cells?
Tunica media
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Which blood vessel transports oxygenated blood from the lungs to the left atrium?
Pulmonary vein
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Which blood vessel layer is thicker in an artery than a vein?
Tunica media
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What is the most important factor determining the resistance of an arteriole?
Radius
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How many genetically different gametes could theoretically be produced in humans due to independent assortment?
More than
8 million
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How often do single nucleotide polymorphisms (SNPs) occur in the human genome?
One in every
1,000
nucleotides
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During which phase of the cell cycle are chromosomes duplicated?
S phase
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During which stages of mitosis are chromosomes each composed of two chromatids?
Metaphase
and
telophase
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What are Okazaki fragments?
Short pieces of
DNA
found on the
lagging strand
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How many hydrogen bonds pair adenine to thymine?
2
hydrogen bonds
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What modification is made to mRNA in eukaryotes?
Splicing
of
introns
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What is the minimum volume of air that remains in the lungs after a maximal expiration called?
Residual volume
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Which cells in the respiratory system secrete surfactant?
Type II alveolar cells
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What is the partial pressure of oxygen in arterial blood normally about?
100
mmHg
(
13 KPa
)
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What do peripheral chemoreceptors mainly respond to?
Increased
[H+]
concentration in arterial blood
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Where is approximately 65% of filtered water and sodium reabsorbed?
Proximal tubule
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What is usually accepted as the best overall index of kidney function?
Glomerular filtration rate
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Which chemical is freely filtered by the kidney and not reabsorbed?
Creatinine
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What does urine normally NOT contain?
Glucose
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What is the liquid-filled sac that protects and buffers a developing embryo called?
Amnion
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What process is termed the “fast block to polyspermy”?
Membrane depolarisation
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Which tissue is NOT formed from embryonic neural crest cells?
Cardiomyocytes
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