Natural selection should favor the highest proportion of juxtamedullary nephrons in which of the following species?
A) a river otter
B) a mouse species living in a tropical rain forest
C) a mouse species living in a temperate broadleaf forest
D) a mouse species living in a desert
E) a beaver
Answer: D
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Biology
- Endocrine structures derived from nervous tissue include the
- Oxytocin and antidiuretic hormone are synthesized in the
- In a lactating mammal, the two hormones that promote milk synthesis and milk release, respectively, are
- To prevent insect pests from maturing into reproducing adults, pest controllers use synthetic agonists of
- A product of the anterior pituitary gland that causes color changes in its target cells is
- Prolactin stimulates mammary gland growth and development in mammals and regulates salt and water balance in freshwater fish. Many scientists think that this wide range of functions indicates that prolactin
- The hypothalamus
- If a person loses a large amount of water in a short period of time, he or she may die from dehydration. ADH can help reduce water loss through its interaction with its target cells in the
- Portal blood vessels connect two capillary beds found in the
- The hypothalamus modulates hormone secretion by the anterior pituitary by means of
- The interrelationships between the endocrine and the nervous systems are especially apparent in
- Based on their effects, which pair below would not be expected to be active at the same time and place?
- During short-term starvation, most available fuel molecules are catabolized to provide energy for metabolism rather than being used as building blocks for growth and repair, a trade-off that is hormonally regulated by
- During mammalian labor and delivery, the contraction of uterine muscles is enhanced by oxytocin. This is an example of
- Hormones that promote homeostasis
- Suppose that substance X is secreted by one cell, travels via interstitial fluid to a neighboring cell, and produces an effect on that cell. All of the following terms could describe this substance except
- Nitric oxide and epinephrine
- For hormones that homeostatically regulate cellular functions,
- When a steroid hormone and a peptide hormone exert similar effects on a population of target cells, then
- Hormone X activates the cAMP second messenger system in its target cells. The greatest response by a cell would come from
- A chemical signal operating in a paracrine manner is one that
- Endocrine glands that are sources of steroid hormones
- Insect hormones and their receptors
- Different body cells can respond differently to the same peptide hormones because
- The reason that the steroid hormone aldosterone affects only a small number of cells in the body is that
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