What is found in the buffy coat when blood is centrifuged? What percent of total blood volume does the buffy coat contribute?
What will be an ideal response?
The buffy coat consists of both leukocytes and platelets. The buffy coat makes up only 1% of total blood volume.
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An investigator places an isolated neuron in a calcium-free medium. They give the neuron a suprathreshold stimulus and then perform an assay to test whether neurotransmitter is released into the medium. Which of the following outcomes would you predict?
a. No neurotransmitter is detected since influx of calcium into the synaptic knob is required for neurotransmitter release. b. No neurotransmitter is detected since influx of calcium is required in order for the neuron to conduct an action potential. c. Neurotransmitter is detected since calcium is not required for action potential conduction and the initial stimulus was suprathreshold. d. We cannot predict the outcome without knowing whether the neuron was myelinated. e. None of these.
Which of the following features account(s) for the greater acuity that occurs in cones, relative to the rods?
a. Different cone opsins have different absorbance maxima for wavelengths of light. b. There is little convergence in the cone system. c. Cones are less sensitive (require a stronger stimulus) than rods. d. All of these contribute to acuity. e. None of these influence acuity.
The flat-shaped cells found covering the skin are ________ in shape
A) cylindrical B) cuboidal C) spherical D) columnar E) squamous
In a contracted muscle, the A bands narrow because the length of the myosin myofilaments changes.
Answer the following statement true (T) or false (F)