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9 multiple-choice questions and 3 flashcards on Endocrine System, about 6% of the HS Anatomy & Physiology bank. Every one carries a written rationale.
Endocrine System is one of 13 chapters in CoStudy's HS Anatomy & Physiology bank, and it holds 9 of the bank's 150 multiple-choice questions — roughly 6% of the total. That proportion is not arbitrary: chapters follow the certifying body's published exam outline, and the number of questions in each is set by that domain's published weight, so the share of your practice time this chapter takes matches the share of the real exam it accounts for.
Studying by chapter is worth doing once you have a diagnostic score. A single overall percentage tells you whether you are close; it does not tell you which domain is dragging. Working a weak chapter in isolation, and re-testing it in isolation, is the fastest way to move a score that has stalled — and it is why the mock exams in CoStudy report by domain rather than as one number.
5 questions drawn from this chapter, with the full rationale shown — the controlling principle behind the right answer, and why each wrong option tempts and fails.
Insulin and glucagon both originate in the pancreas, but they have OPPOSING effects on blood glucose. Which statement is correct?
Answer: C — Insulin lowers blood glucose; glucagon raises it
C) Insulin lowers, glucagon raises — a classic 'reversed-direction' trick. A) Reverses both. B/D) Treat the antagonistic pair as one direction.
Negative feedback regulates body temperature by:
Answer: B — Triggering responses that reverse changes and return to a set point
Negative feedback reverses deviations from a set point — e.g., sweating when hot, shivering when cold — maintaining homeostasis.
Which posterior-pituitary hormone increases water reabsorption in the kidneys?
Answer: A — ADH (antidiuretic hormone / vasopressin)
A) ADH = water reabsorption in collecting ducts. B) Oxytocin = labor + bonding (also posterior pituitary). C) Aldosterone = adrenal cortex; Na⁺/K⁺ balance. D) Cortisol = adrenal cortex; stress/metabolism.
Hormones secreted by the anterior pituitary include:
Answer: D — Growth hormone, prolactin, ACTH, TSH, FSH, and LH
D) Standard anterior-pituitary catalog. B) Pancreas. C) Posterior pituitary. A) Adrenal medulla.
An action potential in a neuron is generated when:
Answer: B — The membrane reaches threshold and voltage-gated sodium channels open, depolarizing the cell
When depolarization reaches threshold (~-55 mV), Na⁺ channels open rapidly, sodium rushes in, and the membrane potential rises sharply — generating an action potential.
1 cards from the 3 in this chapter.
Diaphragm role in breathing?
Contracts (flattens) on inhalation → chest cavity expands → air rushes in. Relaxes on exhalation.
These are a sample. The full Endocrine System chapter runs 12 items with per-chapter progress tracking, on the web and in the iOS app.
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