Provide three reasons for the greater visual acuity at the fovea.
What will be an ideal response?
First, the density of photoreceptive cones is highest at the fovea. Second, each photoreceptor is associated with a single bipolar cell, which prevents the convergence of information within this region of the retina. Third, light does not have to pass through the layers of cells (amacrine, horizontal, etc) before reaching the photoreceptors within the fovea. Less diffraction of light means greater visual acuity.
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Dalton's law of partial pressures states that the total pressure exerted by a mixture of gases is the sum of the pressures exerted independently by each gas in the mixture
Indicate whether the statement is true or false
Polycythemia can be caused by:
a. too few red blood cells b. too little hemoglobin in the blood cells c. too many red blood cells being made d. both A and B above
Answer the following statements true (T) or false (F)
1, Hormonal control of endocrine function is determined by other hormones. 2. Negative feedback rushes to a process to completion. 3. Chemosensitive control of endocrine function is regulated by changes in extracellular fluid. 4. The hypothalamus is controlled by negative feedback. 5. Neural control of endocrine function is determined by the arrival of neurotransmitter at a neuroglandular synapse.
What is the breakdown product of hemoglobin that is found in urine?
A) ketone bodies B) urochrome C) turbidity D) nitrites