1|Page
ATI TEAS SCIENCE PRACTICE 2026-2027 | 200+
QUESTIONS & RATIONALES | HUMAN
ANATOMY & PHYSIOLOGY | BIOLOGY |
CHEMISTRY | SCIENTIFIC REASONING | HIGH-
YIELD CONTENT | A+ TEAS PREP GUIDE
## Table of Contents
1. **Human Anatomy & Physiology – General & Integumentary** (Q1–Q20)
2. **Human Anatomy & Physiology – Musculoskeletal & Nervous** (Q21–Q40)
3. **Human Anatomy & Physiology – Cardiovascular & Respiratory** (Q41–
Q65)
4. **Human Anatomy & Physiology – Gastrointestinal & Nutrition** (Q66–Q85)
5. **Human Anatomy & Physiology – Renal, Endocrine & Reproductive** (Q86–
Q110)
6. **Biology – Cell Structure & Function** (Q111–Q130)
7. **Biology – Genetics, DNA & Protein Synthesis** (Q131–Q150)
8. **Biology – Metabolism, Enzymes & Cellular Respiration** (Q151–Q165)
9. **Chemistry – Atomic Structure, Periodic Table & Bonding** (Q166–Q185)
10. **Chemistry – Solutions, Acids/Bases & Chemical Reactions** (Q186–Q200)
11. **Scientific Reasoning & Research Design** (Q201–Q215)
,2|Page
Section 1: Human Anatomy & Physiology – General & Integumentary
(Q1–Q20)
**Q1.** Which term describes the maintenance of a stable internal
environment despite external changes?
A. Homeostasis
B. Metabolism
C. Anabolism
D. Catabolism
**Correct Answer: A – Homeostasis**
*Rationale: Homeostasis is the body’s ability to maintain stable internal
conditions.*
**Q2.** The plane that divides the body into left and right halves is the:
A. Sagittal plane
B. Coronal plane
C. Transverse plane
D. Frontal plane
**Correct Answer: A – Sagittal plane**
*Rationale: Sagittal plane divides into left and right; midsagittal divides
into equal halves.*
,3|Page
**Q3.** Which layer of the skin contains blood vessels, nerves, and hair
follicles?
A. Dermis
B. Epidermis
C. Hypodermis
D. Stratum corneum
**Correct Answer: A – Dermis**
*Rationale: The dermis is the vascular layer containing connective
tissue, hair follicles, and glands.*
**Q4.** The outermost layer of the epidermis, composed of dead
keratinized cells, is the:
A. Stratum corneum
B. Stratum basale
C. Stratum spinosum
D. Stratum granulosum
**Correct Answer: A – Stratum corneum**
*Rationale: Stratum corneum is the outermost protective layer of dead
cells.*
, 4|Page
**Q5.** Which gland secretes sebum to lubricate skin and hair?
A. Sebaceous gland
B. Sweat gland (eccrine)
C. Apocrine gland
D. Mammary gland
**Correct Answer: A – Sebaceous gland**
*Rationale: Sebaceous glands produce sebum, an oily substance that
waterproofs skin.*
**Q6.** Which type of feedback mechanism amplifies a change (e.g.,
blood clotting, childbirth)?
A. Positive feedback
B. Negative feedback
C. Homeostatic feedback
D. Neutral feedback
**Correct Answer: A – Positive feedback**
*Rationale: Positive feedback amplifies the initial stimulus; negative
feedback reverses it.*
**Q7.** Which vitamin is synthesized in the skin upon exposure to
sunlight?
ATI TEAS SCIENCE PRACTICE 2026-2027 | 200+
QUESTIONS & RATIONALES | HUMAN
ANATOMY & PHYSIOLOGY | BIOLOGY |
CHEMISTRY | SCIENTIFIC REASONING | HIGH-
YIELD CONTENT | A+ TEAS PREP GUIDE
## Table of Contents
1. **Human Anatomy & Physiology – General & Integumentary** (Q1–Q20)
2. **Human Anatomy & Physiology – Musculoskeletal & Nervous** (Q21–Q40)
3. **Human Anatomy & Physiology – Cardiovascular & Respiratory** (Q41–
Q65)
4. **Human Anatomy & Physiology – Gastrointestinal & Nutrition** (Q66–Q85)
5. **Human Anatomy & Physiology – Renal, Endocrine & Reproductive** (Q86–
Q110)
6. **Biology – Cell Structure & Function** (Q111–Q130)
7. **Biology – Genetics, DNA & Protein Synthesis** (Q131–Q150)
8. **Biology – Metabolism, Enzymes & Cellular Respiration** (Q151–Q165)
9. **Chemistry – Atomic Structure, Periodic Table & Bonding** (Q166–Q185)
10. **Chemistry – Solutions, Acids/Bases & Chemical Reactions** (Q186–Q200)
11. **Scientific Reasoning & Research Design** (Q201–Q215)
,2|Page
Section 1: Human Anatomy & Physiology – General & Integumentary
(Q1–Q20)
**Q1.** Which term describes the maintenance of a stable internal
environment despite external changes?
A. Homeostasis
B. Metabolism
C. Anabolism
D. Catabolism
**Correct Answer: A – Homeostasis**
*Rationale: Homeostasis is the body’s ability to maintain stable internal
conditions.*
**Q2.** The plane that divides the body into left and right halves is the:
A. Sagittal plane
B. Coronal plane
C. Transverse plane
D. Frontal plane
**Correct Answer: A – Sagittal plane**
*Rationale: Sagittal plane divides into left and right; midsagittal divides
into equal halves.*
,3|Page
**Q3.** Which layer of the skin contains blood vessels, nerves, and hair
follicles?
A. Dermis
B. Epidermis
C. Hypodermis
D. Stratum corneum
**Correct Answer: A – Dermis**
*Rationale: The dermis is the vascular layer containing connective
tissue, hair follicles, and glands.*
**Q4.** The outermost layer of the epidermis, composed of dead
keratinized cells, is the:
A. Stratum corneum
B. Stratum basale
C. Stratum spinosum
D. Stratum granulosum
**Correct Answer: A – Stratum corneum**
*Rationale: Stratum corneum is the outermost protective layer of dead
cells.*
, 4|Page
**Q5.** Which gland secretes sebum to lubricate skin and hair?
A. Sebaceous gland
B. Sweat gland (eccrine)
C. Apocrine gland
D. Mammary gland
**Correct Answer: A – Sebaceous gland**
*Rationale: Sebaceous glands produce sebum, an oily substance that
waterproofs skin.*
**Q6.** Which type of feedback mechanism amplifies a change (e.g.,
blood clotting, childbirth)?
A. Positive feedback
B. Negative feedback
C. Homeostatic feedback
D. Neutral feedback
**Correct Answer: A – Positive feedback**
*Rationale: Positive feedback amplifies the initial stimulus; negative
feedback reverses it.*
**Q7.** Which vitamin is synthesized in the skin upon exposure to
sunlight?
