Discuss the role of hormones in maintaining blood calcium levels
What will be an ideal response?
Parathyroid hormone (PTH), produced by the parathyroid glands, is the most important regulator of blood calcium levels. PTH is a hypercalcemic hormone, meaning that it is secreted in response to low blood calcium levels. PTH stimulates osteoclasts to destroy bone matrix and release the calcium into the blood, raising blood calcium levels. PTH also targets the intestine and kidneys to absorb calcium. PTH works opposite to calcitonin, whose job is to lower blood calcium levels through deposition to bones.
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A descending pathway carries
A. motor information from the body to the brain. B. sensory information from the brain to the body. C. both motor and sensory information from the body to the brain. D. motor information from the brain to muscles and glands. E. sensory information from the body to the brain.
In response to action potentials arriving along the transverse tubules, the sarcoplasmic reticulum releases
What will be an ideal response?
Which of the following consists of a network of intracellular membranes with attached ribosomes?
A) rough endoplasmic reticulum B) smooth endoplasmic reticulum C) mitochondria D) nucleoli E) Golgi apparatus
The entry of calcium into the synaptic knob triggers ____.
Fill in the blank(s) with the appropriate word(s).