Start learning →

AP Biology Unit 8Q: Toxicology, Environmental Hazards & Health — practice questions — page 3

Explore 83 free Unit 8Q: Toxicology, Environmental Hazards & Health questions in AP Biology Biology. Open each question or exercise to read its content, reference answers and available explanation.

Practise Unit 8Q: Toxicology, Environmental Hazards & Health with Quill →

Unit 8Q: Toxicology, Environmental Hazards & Health questions and exercises with answers

Showing questions 61–83 of 83.

Calcium for muscle contraction is released from:Read the answer and worked solution →The smallest bones of human body are in the:Read the answer and worked solution →Tendons connect:Read the answer and worked solution →Knee joint type:Read the answer and worked solution →Adult human skeleton has approximately how many bones?Read the answer and worked solution →As per your syllabus, in AEROBIC respiration, where in the cell does the breakdown of PYRUVATE using oxygen take place?Read the answer and worked solution →As per your syllabus, what does ANAEROBIC respiration in YEAST produce from pyruvate?Read the answer and worked solution →As per your syllabus, what is the energy released when the TERMINAL PHOSPHATE bond in ATP is broken using water?Read the answer and worked solution →As per your syllabus, what is the cup-shaped structure at the start of each nephron that collects the FILTRATE from the capillary cluster?Read the answer and worked solution →As per your syllabus, what is the main NITROGENOUS WASTE removed by human kidneys?Read the answer and worked solution →As per your syllabus, how do PLANTS get rid of EXCESS WATER?Read the answer and worked solution →Blood is BEST classified asRead the answer and worked solution →Plasma constitutes approximately what fraction of blood by volume?Read the answer and worked solution →The pigment that gives erythrocytes their red colour isRead the answer and worked solution →The average lifespan of a human red blood cell is aboutRead the answer and worked solution →Which leucocyte is the MOST abundant in human blood?Read the answer and worked solution →Persons with blood group O are calledRead the answer and worked solution →The pacemaker of the human heart is theRead the answer and worked solution →The first heart sound ('lub') is produced byRead the answer and worked solution →Normal resting blood pressure of a healthy adult is approximatelyRead the answer and worked solution →Hepatic portal system carries blood fromRead the answer and worked solution →Plasma without clotting factors is calledRead the answer and worked solution →Granulocytes among WBCs includeRead the answer and worked solution →

Worked practice questions

Calcium for muscle contraction is released from:

  1. Blood
  2. Nucleus
  3. Mitochondria
  4. Sarcoplasmic reticulum (specialized ER of muscle cells)
Show answer and solution

Correct answer: D. Sarcoplasmic reticulum (specialized ER of muscle cells)

**SR:** Ca²⁺ store. Depolarization of T-tubule (action potential along muscle membrane) → DHPR triggers RyR (ryanodine receptor) on SR → Ca²⁺ floods sarcoplasm. Ca²⁺ binds troponin C → tropomyosin shifts → exposes myosin-binding sites on actin → cross-bridge cycling. SERCA pumps Ca²⁺ back into SR for relaxation.

Open this question →

The smallest bones of human body are in the:

  1. Foot
  2. Skull
  3. Middle ear — malleus, incus, stapes (ossicles)
  4. Hand
Show answer and solution

Correct answer: C. Middle ear — malleus, incus, stapes (ossicles)

Ossicles (malleus, incus, stapes) in middle ear: smallest bones in body. Stapes is smallest (~3 mm). They transmit and amplify sound from tympanic membrane to oval window of cochlea. **Otosclerosis:** pathological fusion → conductive hearing loss.

Open this question →

Tendons connect:

  1. Bone-to-bone
  2. Muscle-to-bone — collagen-rich connective tissue
  3. Skin-to-bone
  4. Two muscles
Show answer and solution

Correct answer: B. Muscle-to-bone — collagen-rich connective tissue

**Tendons:** dense regular CT, mostly type I collagen. Connect muscle to bone, transmit muscle force to skeleton. Highly tensile but poor blood supply → slow healing after rupture (e.g., Achilles). **Ligaments:** connect bone-to-bone (different role, similar composition).

Open this question →

How to practise

  1. Choose a Unit 8Q: Toxicology, Environmental Hazards & Health question and try to work out your answer.
  2. Open the question to check the correct answer and read its worked solution.
  3. Continue in the app for bite-sized lessons, explanations and review with Quill. You can start without creating an account.

Put it into practice

Continue with Unit 8Q: Toxicology, Environmental Hazards & Health practice for AP Biology. Read explanations as you go. No signup form needed to start.

Practise Unit 8Q: Toxicology, Environmental Hazards & Health →

More Biology topics

Unit 5C: Non-Mendelian Genetics & Population TransmissionUnit 2B: Membrane Transport, Tonicity & Cell SizeUnit 8K: Human Organ Systems & HomeostasisUnit 3B: Photosynthesis, Respiration & Cellular EnergyUnit 7B: Population Genetics & Hardy-Weinberg EvolutionUnit 2G: Osmoregulation & Membrane DynamicsUnit 8R: Environmental Pollution & Organismal HealthUnit 5D: Organismal Reproduction & Life Cycles