A biologist from the United States Forest Service estimated the population of guppies in a pond to be 30,000 per cubic meter. This is also known as the
A. population density.
B. density-dependent factor.
C. natality.
D. None of these answers is true.
A. population density.
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The endoplasmic reticulum is mostly devoid of ribosomes (smooth) when cells are producing large quantities of lipid.
Answer the following statement true (T) or false (F)
Answer the following statements true (T) or false (F)
1.Calcitonin and parathyroid hormone have effects which generally oppose one another. 2.Neurotransmitters and hormones never share the same target cells. 3.The two hormones produced by the thyroid are thyroxine and triiodothyronine. 4.Exercise leads to weaker muscles due to the repeated strain, which damages the muscle. 5.The temporalis muscle is critical for chewing.
The structure that is at the center of control for endocrine activity, particularly as it relates to homeostasis, is the:
A) brain stem. B) cerebral cortex. C) posterior pituitary gland. D) hypothalamus. E) thyroid gland.
Your doctor returns with your lab results and looks grave. "I'm afraid," she says, "you seem to have a problem with your hypophysis." What do you say?
A. "Am I going to need insulin shots?" B. "Doctor, right now I'm interested in results, not testable ideas about how things work!" C. "Is it the posterior? Neurological problems run in my family." D. "Well, that's only responsible for one or two hormones, so it should be easy to treat."