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14 multiple-choice questions and 19 flashcards on Body Systems and Homeostasis, about 9% of the 7th Grade Science bank. Every one carries a written rationale.
Body Systems and Homeostasis is one of 5 chapters in CoStudy's 7th Grade Science (Life Science) bank, and it holds 14 of the bank's 150 multiple-choice questions — roughly 9% 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.
7 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.
The nervous system's PRIMARY role is:
Answer: C — Detecting stimuli and coordinating responses throughout the body
The nervous system (brain, spinal cord, nerves) detects stimuli and coordinates voluntary/involuntary responses. (A) circulatory; (B) digestive; (D) endocrine system produces hormones.
HOMEOSTASIS is disrupted. A patient has blood sugar levels twice the normal value. Which body system is MOST likely malfunctioning?
Answer: C — Endocrine system (e.g., insulin regulation)
Blood sugar regulation = endocrine function (insulin from pancreas). Diabetes involves disrupted insulin production/response. (A/B) structural/movement; (D) oxygen transport.
Insulin is produced by the pancreas and regulates blood sugar. Which system does insulin belong to?
Answer: C — Endocrine system
Insulin is a hormone — hormones are products of the endocrine system. (A) nervous system uses electrical signals; (B) skeletal provides structure; (D) digestive processes food.
The human body's ability to maintain a stable internal environment is called:
Answer: B — Homeostasis
Homeostasis = maintaining internal balance (body temperature, blood sugar, pH) despite external changes. (A) metabolism is all chemical reactions; (C) respiration produces ATP; (D) diffusion is particle movement.
In humans, the circulatory system primarily:
Answer: A — Transports oxygen, nutrients, hormones, and waste throughout the body
A) Transport role. B) Digestive system. C) Nervous system. D) Adipose tissue role.
Which body system removes waste products from the blood?
Answer: C — Excretory/urinary system
The excretory/urinary system (kidneys, ureter, bladder) filters blood and removes waste as urine. (A) removes CO₂; (B) enables movement; (D) produces hormones.
Which level of biological organization is the LARGEST in the standard hierarchy: cells, tissues, organs, organ systems, organism?
Answer: D — Organism
D) Organism encompasses organ systems, which contain organs, tissues, then cells. The cell is the smallest level of life, organism the largest in this list.
4 cards from the 19 in this chapter.
What is 'biodiversity'?
The variety of different organisms in an ecosystem. More biodiversity = healthier, more stable ecosystem.
What is the 'circulatory system'?
Heart, blood, blood vessels — transports oxygen, nutrients, waste throughout the body.
What's the difference between unicellular and multicellular?
Unicellular = one cell (bacteria). Multicellular = many cells working together (plants, animals).
What two words make up a scientific name?
Genus + species. Like 'Homo sapiens' for humans.
These are a sample. The full Body Systems and Homeostasis chapter runs 33 items with per-chapter progress tracking, on the web and in the iOS app.
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