Questions and Answers
Which of the following pairs is MISMATCHED? (Select all that apply)
Which of the following hormones is currently thought to decrease plasma calcium levels in pregnant women and children?
PTH promotes the formation of which hormone?
Which of the following would NOT be a way that parathyroid hormone (PTH) could alter plasma calcium levels? (Which one of the following is FALSE?)
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Which hormone works directly in the intestine to increase plasma calcium levels?
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Osteoid-producing osteoblasts must rely upon which organelle to produce primary structures leading to the formation of collagen and calcium-binding proteins?
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Changes to which of the following components would make the bones less strong overall and cause the bones to bend under a person's body weight?
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Bones do NOT have a role in __________.
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Study Notes
Bone Classification and Examples
- Femur is classified as a long bone, while the sternum is inaccurately categorized as a long bone; it is actually a flat bone.
- Tarsals are identified correctly as short bones, and skull bones are correctly identified as flat bones.
Hormones and Calcium Levels
- Calcitonin is believed to reduce plasma calcium levels in pregnant women and children.
- Parathyroid hormone (PTH) promotes the formation of calcitriol, a hormone essential for calcium absorption.
Functions of Parathyroid Hormone (PTH)
- PTH increases kidney reabsorption of calcium and stimulates osteoclasts to elevate plasma calcium levels.
- PTH does not increase osteoblast activity in bone, which would not enhance calcium levels as osteoblasts are primarily responsible for bone formation.
Intestinal Calcium Regulation
- Calcitriol acts directly in the intestines to elevate plasma calcium levels, promoting absorption of dietary calcium.
Osteoblast Functionality
- Osteoid-producing osteoblasts depend on ribosomes to synthesize collagen and calcium-binding proteins, essential components of bone matrix.
Strength of Bones
- Hydroxyapatite is critical for maintaining bone strength; alterations could lead to weakened bones, making them susceptible to bending under weight.
Bone Functions
- Bones do not contribute to glycogen production, distinguishing their functions from organs involved in energy storage.
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Description
Test your knowledge on bone classification and the hormonal regulation of calcium levels in the body. This quiz covers the types of bones, functions of parathyroid hormone, and the role of calcitriol in calcium absorption. Perfect for students studying biology and human anatomy.
