Question

question 23
1 pts
which of the following areas has the highest concentration of cones?
the ora serrata retinae
the optic disc
the macula lutea
the fovea centralis
question 24
1 pts
which of the following is not part of the flow of taste sensation along the gustatory pathway to the cerebral cortex?
hypothalamic appetite centers
vagus nerve
solitary nucleus of the medulla oblongata
thalamic nuclei
question 25
1 pts
which endocrine gland stores enough of its hormone extracellularly to last several months?
the thyroid
the pancreas
the ovary
the pituitary

Explanation:

• Question 23: The fovea centralis is a small pit in the macula lutea of the retina. It has the highest concentration of cone cells, which are responsible for sharp central vision and color vision. The ora serrata retinae is the junction between the retina and the ciliary body. The optic disc is where the optic nerve exits the eye and has no photoreceptor cells (rods or cones). The macula lutea has a high concentration of cones, but the fovea centralis (which is part of the macula lutea) has an even higher concentration.
• Question 24: The gustatory pathway involves taste buds, cranial nerves (including the vagus nerve for taste from the epiglottis), the solitary nucleus of the medulla oblongata (where the first - order neurons synapse), and thalamic nuclei (where the second - order neurons synapse before projecting to the cerebral cortex). The hypothalamic appetite centers are involved in regulating hunger and satiety, not in the direct transmission of taste sensation to the cerebral cortex.
• Question 25: The thyroid gland stores thyroid hormones (thyroxine - T4 and triiodothyronine - T3) in the form of thyroglobulin in the colloid of its follicles. This storage is sufficient to last several months. The pancreas stores insulin and glucagon in granules within its cells, but the storage is not as long - term as in the thyroid. The ovary stores hormones like estrogen and progesterone in cells, but not in the large extracellular amounts like the thyroid. The pituitary gland stores hormones like growth hormone, but again, not in the same extracellular, long - term storage capacity as the thyroid.

Answer:

• Question 23: the fovea centralis
• Question 24: hypothalamic appetite centers
• Question 25: the thyroid