Medical Imaging and Physiology Quiz

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Questions and Answers

Which type of decay involves the emission of high-energy photons?

  • Beta decay
  • Neutron decay
  • Gamma decay (Correct) (correct)
  • Alpha decay

In which part of the nervous system does signal compression not occur?

  • Motor Neurons
  • Peripheral Nervous System
  • CNS (Correct) (correct)
  • Sensory Neurons

What does signal adaptation refer to?

  • The receptor adjusting to a continuous stimulus by reducing sensitivity (Correct) (correct)
  • Conversion of a signal from one form to another
  • The decay of a signal over distance
  • The process of amplifying a weak signal

Where are alpha particles primarily used?

<p>Therapeutics (Correct) (A)</p> Signup and view all the answers

What is the primary function of the leg abductor muscle?

<p>Stabilize the body during rotation in the hip joint (A)</p> Signup and view all the answers

Which molecule is an example of a radioactive isotope?

<p>Technetium-99m (D)</p> Signup and view all the answers

What does the Na/K ATPase pump primarily do?

<p>Maintain cellular hydration by pumping sodium out and potassium into the cell (C)</p> Signup and view all the answers

What does an electrocardiogram (EKG) primarily contain information about?

<p>The electrical activity of the heart (C)</p> Signup and view all the answers

What causes turbulence in blood flow?

<p>Higher pressure (A)</p> Signup and view all the answers

What are stereocilia in the inner ear primarily involved in?

<p>Balance (C)</p> Signup and view all the answers

What does MRI stand for?

<p>Magnetic Resonance Imaging (D)</p> Signup and view all the answers

What is the primary function of facilitated diffusion?

<p>To transport molecules across membranes without requiring energy (D)</p> Signup and view all the answers

What does gamma radiation alter as it passes through the body?

<p>Nuclei of cells (D)</p> Signup and view all the answers

What does an ammeter measure?

<p>Electrical current flowing through a circuit (D)</p> Signup and view all the answers

What is the primary cause of radioactivity?

<p>Nuclear instability (C)</p> Signup and view all the answers

What is the function of a tracer in Positron Emission Tomography (PET) imaging?

<p>To track specific molecules or substances (C)</p> Signup and view all the answers

What is the principle underlying X-ray imaging?

<p>Ionizing radiation (D)</p> Signup and view all the answers

What does MRI stand for?

<p>Magnetic Resonance Imaging (D)</p> Signup and view all the answers

In which medical application is the Doppler effect primarily used?

<p>Measuring blood flow (A)</p> Signup and view all the answers

What is the unit of resistance?

<p>Ohm (A)</p> Signup and view all the answers

What is the primary function of Doppler effect in medicine?

<p>Measuring blood flow (B)</p> Signup and view all the answers

What contributes most to the resting membrane potential?

<p>Potassium channels (B)</p> Signup and view all the answers

What does an ammeter measure?

<p>Current (D)</p> Signup and view all the answers

What is the primary use of beta particles in medicine?

<p>Diagnostic imaging (D)</p> Signup and view all the answers

Which radiation is the hardest to absorb?

<p>Gamma rays (B)</p> Signup and view all the answers

What is the primary function of the retina?

<p>Detecting light and initiating visual signals (D)</p> Signup and view all the answers

What is the typical threshold of hearing?

<p>2-3 kHz (D)</p> Signup and view all the answers

What do myelinated fibers primarily contribute to?

<p>Fast conduction of information (A)</p> Signup and view all the answers

What primarily affects the lateral resolution in ultrasound?

<p>Width of the ultrasound beam (D)</p> Signup and view all the answers

What primarily affects the apparent blood viscosity?

<p>Diameter of blood vessels, plasma viscosity, and haematocrit value (B)</p> Signup and view all the answers

What does Poiseuille’s law primarily describe?

<p>$Q = \frac{\text{Change in pressure} \times \text{pi} \times r^4},{8 \times \text{viscosity} \times \text{length}}$ (C)</p> Signup and view all the answers

What are stereocilia in the inner ear primarily involved in?

<p>Balance (B)</p> Signup and view all the answers

What property affects the resolution of CT scans compared to MRI?

<p>Better resolution than MRI (A)</p> Signup and view all the answers

What does contraction of ciliary muscles primarily affect?

<p>Shape of the lens (C)</p> Signup and view all the answers

What is the primary function of radioimmunoassay (RIA)?

<p>Measuring presence and concentration of specific substances in a sample (A)</p> Signup and view all the answers

What unit is used for exposure dose?

<p>Sievert (D)</p> Signup and view all the answers

What does voltage-gated Na+ channels primarily respond to?

<p>Membrane depolarization (A)</p> Signup and view all the answers

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Study Notes

  • Mb-99 molibden is an example of a molecule.

  • The leg abductor muscle's primary function is to stabilize the body during rotation in the hip joint.

  • A cyst is a body mass filled with fluid, anechoic in nature.

  • Technetium-99m does not have the property of being expensive.

  • The Na/K ATPase pump is responsible for maintaining cellular hydration by pumping sodium out and potassium into the cell.

  • An electrocardiogram (EKG) contains information about the electrical activity of the heart, specifically Eindhoven triangles.

  • The main cause of turbulence in blood flow is higher pressure.

  • When standing on one leg, there is a 7x increase in load on the femur head.

  • Stereocilia in the inner ear are involved in balance.

  • MRI stands for Magnetic Resonance Imaging.

  • Gamma rays are the hardest radiation to absorb.

  • An electrocardiogram (EKG) contains information about the electrical activity of the heart, specifically Eindhoven triangles.

  • The primary function of the Na/K ATPase pump is to pump sodium out and potassium into the cell.

  • Technetium-99m is not radioactive or expensive, it is used in medical diagnostics and has a half-life of 6 hours.

  • The leg abductor muscle's primary function is to stabilize the body during rotation in the hip joint.

  • Fluoroscopy layers primarily provide dynamic imaging.

  • Spherical aberration is caused by imperfect curvature of lenses.

  • If there is a threefold increase in the lumen of a vessel, the velocity of the blood flow increases threefold.

  • The Nernst equation calculates the membrane potential.

  • The resistance of the renal artery is typically 0.6 ohms.

  • When gamma radiation goes through the body, it alters the nuclei of cells.

  • The lumbosacral angle is typically 40 degrees.

  • Facilitated diffusion is a process that does not require energy and depends on carrier proteins.

  • Technetium-99 is generated from molibden and not from uranium, alpha decay, or chemical synthesis.

  • The main function of the leg abductor muscle is to stabilize the body during rotation in the hip joint.

  • A cyst is primarily characterized by being a body mass filled with fluid, anechoic in nature.

  • The threshold of hearing is typically between 2-3 kHz.

  • Turbulence is more likely to occur in blood flow at higher Reynolds numbers.

  • X-rays have larger energy and lower penetration than gamma rays.

  • The osmotic coefficient of albumin is typically higher than 1.5.

  • The contraction of ciliary muscles affects the shape of the lens.

  • The purpose of the ear drum is to transmit sound waves to the inner ear.

  • Sensory system functions include: detection (sight, touch, taste, smell, hearing), sound amplification, balance, and filtering frequencies.

  • Intensity of X-rays increases as tube voltage increases.

  • Threshold of hearing is typically between 2-3 kHz.

  • Ultrasound crystals resonating result in increased resolution.

  • CT scans have better resolution than MRI.

  • Lateral resolution in ultrasound is determined by the width of the ultrasound beam.

  • Stereocilia in the inner ear are involved in balance.

  • Osmotic coefficient of albumin is typically higher than 1.5.

  • Contraction of ciliary muscles affects the shape of the lens.

  • Retina is the part of the eye that is light sensitive.

  • Technetium-99m does not have the property of being expensive.

  • Serum tests are run to determine electrolyte balance, hormone levels, and other substances.

  • Plasma primarily consists of proteins, electrolytes, antibodies, antigens, and hormones.

  • Multiple myeloma is a cancer of bone marrow and malignant plasma cells.

  • Vitamin C is effective in treating iron deficiency.

  • There are two types of insulin: dependent and non-dependent.

  • The ear differentiates frequencies using different wavelengths and intervals.

  • Myelinated fibers conduct information fast.

  • Radioimmunoassay (RIA) is used to measure the presence and concentration of specific substances in a sample.

  • Gamma rays are the hardest radiation to absorb.

  • The unit for exposure dose is sievert.

  • Vitamin K is important for blood clotting, but not for maintaining the membrane potential of muscle and nerve fibers.

  • In obstructive jaundice, the skin appears yellow due to increased bilirubin in the blood.

  • During walking, the hip performs an unloading motion.

  • Poiseuille’s law describes the flow resistance of each vessel.

  • Fluid flow becomes turbulent when the Reynolds number exceeds the critical value.

  • Apparent blood viscosity is influenced by diameter of blood vessels, plasma viscosity, and haematocrit value.

  • Diastole duration decreases as heart rate increases.

  • Water molecules in liquid water interact via van der Waals forces.

  • A single neuron can have hundreds to thousands of synapses.

  • Voltage-gated Na+ channels open when the membrane is depolarized.

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