Calcium Levels in the Body Are Maintained by Hormones

question 76

Multiple Choice

Calcium levels in the body are maintained by hormones. If the blood calcium level rises above a set point, calcitonin is secreted by the thyroid gland and sets into motion responses to lower the blood calcium back to the set point. If the blood calcium level falls below a set point, the parathyroid gland secretes parathyroid hormone that sets into motion responses to raise the blood calcium. These homeostatic responses are examples of

• A) positive feedback.
• B) effectors.
• C) sensors.
• D) negative feedback.

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Definitions:

Unforeseeable Events

Circumstances or incidents that could not have been predicted or expected and therefore may relieve parties from liability in contracts under the doctrine of force majeure.

Contract Obligations

Responsibilities and duties that parties are legally bound to perform as per the terms of a contract.

Commercial Impracticability

A doctrine in contract law that excuses a party from fulfilling their contractual obligations due to unforeseen, extreme hardships.

Revoking Acceptance

The act of legally rejecting a product or service after initially accepting it, based on certain conditions being met.