The thyroid gland secretes the hormones thyroxine and calcitonin. Embedded in the thyroid gland are the four parathyroid glands . The parathyroid glands secrete the parathyroid hormone (PTH ). Calcitonin and PTH work antagonistically to maintain homeostasis of calcium ion concentrations in the blood. High levels of calcium ions stimulate the secretion of calcitonin , which causes deposition of calcium in the bones” Low levels of calcium ions in the blood cause A. decreased secretion of PTH and increased deposition of calcium in the bones B. decreased secretion of calcium and increased deposition of calcium in the blood. C. increased secretion of PTH and movemen of calcium from the bones to the blood D. increase secretion of calcitonin and movement of calcium from the bones to the blood 2. Scientists have discovered that a molecule called allicin causes the characteristic burning taste produced by raw garlic. When allicin attaches to specialized receptors on a neuroncalcium channels in the membrane open. This results in the flow of calcium ions Ca^ 2+ into the neuronwhich causes a reversal of charge inside a resting neuron. The effect of allicin on a neuron is similar to the effect of A. cholinesterase B. potassium ions C. an inhibitory neurotransmitter D. an excitatory neurotransmitter

Human Anatomy & Physiology (11th Edition)

11th Edition

ISBN:9780134580999

Author:Elaine N. Marieb, Katja N. Hoehn

Publisher:Elaine N. Marieb, Katja N. Hoehn

Chapter1: The Human Body: An Orientation

Section: Chapter Questions

Problem 1RQ: The correct sequence of levels forming the structural hierarchy is A. (a) organ, organ system,...

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Need help with questions 1 and 2 1. “The thyroid gland secretes the hormones thyroxine and calcitonin. Embedded in the thyroid gland are the four parathyroid glands . The parathyroid glands secrete the parathyroid hormone (PTH ). Calcitonin and PTH work antagonistically to maintain homeostasis of calcium ion concentrations in the blood. High levels of calcium ions stimulate the secretion of calcitonin , which causes deposition of calcium in the bones” Low levels of calcium ions in the blood cause A. decreased secretion of PTH and increased deposition of calcium in the bones B. decreased secretion of calcium and increased deposition of calcium in the blood. C. increased secretion of PTH and movemen of calcium from the bones to the blood D. increase secretion of calcitonin and movement of calcium from the bones to the blood 2. Scientists have discovered that a molecule called allicin causes the characteristic burning taste produced by raw garlic. When allicin attaches to specialized receptors on a neuroncalcium channels in the membrane open. This results in the flow of calcium ions Ca^ 2+ into the neuronwhich causes a reversal of charge inside a resting neuron. The effect of allicin on a neuron is similar to the effect of A. cholinesterase B. potassium ions C. an inhibitory neurotransmitter D. an excitatory neurotransmitter

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