ATI TEAS 7 Science 2025 — 55 Q&A Complete Practice Exam
Verified Answers
Series:
CrashCourses Professional Study Series
Author:
Dr Z. Moomba, MBChB, MRCPsych | BethelWellness Ltd
Exam Target:
ATI TEAS 7
Year:
2025/2026
Format:
55 Questions with Verified Answers and Rationales
>
Author's Note:
This document is an original work produced for the CrashCourses Professional Study Series.
Clinical questions and professional scenarios were composed by Dr Z. Moomba based on current
exam objectives, published guidelines, and evidence-based sources (2024–2025). All patient
names, ages, and case details are fictional. Any resemblance to existing published Q&A banks is
coincidental. For personal study use only — not for reproduction or redistribution.
SECTION A — FOUNDATIONS
Question 1
A 45-year-old patient presents to the clinic with a laceration on the anterior surface of their
forearm, distal to the antecubital fossa. Based on anatomical terminology, which of the following
best describes the location of this wound?
A) On the back of the arm, closer to the shoulder than the elbow.
B) On the front of the lower arm, closer to the wrist than the elbow.
C) On the front of the lower arm, further away from the shoulder than the elbow crease.
D) On the back of the lower arm, near the wrist joint.
,Answer: C
Rationale:
The anterior surface refers to the front of the body, and "distal to the antecubital fossa" means
further away from the origin of the limb (shoulder) than the elbow crease.
The defining feature here is understanding "anterior" (front) and "distal" (further from the point of
attachment).
Option B is tempting but "closer to the wrist than the elbow" makes assumptions about the exact
midpoint; "further away from the shoulder than the elbow crease" is the strict translation of "distal
to the antecubital fossa".
Examiner Pearl: Always relate distal and proximal to the limb's point of attachment to the trunk.
[ATI TEAS Science Foundations 2025]
Question 2
During an intense workout, a healthy 28-year-old begins to sweat profusely. As their internal body
temperature rises, thermoreceptors in the skin send signals to the hypothalamus, which triggers
vasodilation and sweating to cool the body down. This process is an example of which of the
following?
A) Positive feedback loop
B) Negative feedback loop
C) Feedforward mechanism
D) Cellular respiration
Answer: B
Rationale:
A negative feedback loop works to reverse a change in a controlled condition, bringing the body
back to its normal set point (homeostasis).
The hallmark of negative feedback is the reversal of the initial stimulus (high temperature is
countered by cooling mechanisms).
Positive feedback is a common distractor, but it amplifies a stimulus (like oxytocin in childbirth)
rather than reversing it.
Examiner Pearl: 99% of homeostatic mechanisms in the human body rely on negative feedback.
[Guyton & Hall Physiology 2024]
,Question 3
A patient sustains a severe burn that destroys the epidermis and dermis, reaching the
subcutaneous tissue, but they report feeling no pain at the center of the burn. Which structural
component of the integumentary system has been destroyed to cause this lack of sensation?
A) Melanocytes
B) Stratum corneum
C) Sebaceous glands
D) Nerve endings
Answer: D
Rationale:
Sensory nerve endings and receptors responsible for detecting pain, temperature, and touch are
located primarily in the dermis.
The destruction of the dermis in a full-thickness (third-degree) burn destroys these nerve
endings, leading to a painless wound center.
Melanocytes (Option A) are in the stratum basale of the epidermis and produce pigment, playing
no direct role in pain sensation.
Examiner Pearl: Third-degree burns are often painless locally because the dermal sensory
receptors are obliterated. [Burn Care Guidelines 2025]
Question 4
A 65-year-old postmenopausal woman is diagnosed with osteoporosis, a condition characterized
by a decrease in bone density. Which type of bone cell is overly active relative to its counterpart in
this condition?
A) Osteoblasts
B) Osteoclasts
C) Osteocytes
D) Chondrocytes
Answer: B
Rationale:
Osteoclasts are responsible for bone resorption (breaking down bone tissue), releasing minerals
like calcium into the blood.
, In osteoporosis, the resorptive activity of osteoclasts outpaces the bone-forming activity of
osteoblasts, leading to weakened bones.
Osteoblasts (Option A) build bone; if they were overly active, bone density would increase, not
decrease.
Examiner Pearl: Remember "Clasts Consume, Blasts Build" to quickly differentiate these bone cell
functions. [TEAS Bone Physiology 2025]
Question 5
During a laboratory experiment observing skeletal muscle contraction, an injection of a chemical
that blocks the release of calcium ions from the sarcoplasmic reticulum is administered. What will
be the immediate physiological effect on the muscle fiber?
A) Myosin heads will bind to actin more firmly.
B) ATP production in the mitochondria will cease immediately.
C) Tropomyosin will remain covering the myosin-binding sites on actin.
D) The muscle fiber will undergo continuous, sustained tetanic contraction.
Answer: C
Rationale:
Calcium ions bind to troponin, causing a conformational change that moves tropomyosin away
from the myosin-binding sites on actin, allowing cross-bridge formation.
Without calcium release, tropomyosin blocks the binding sites, making muscle contraction
impossible according to the sliding filament theory.
Option D is incorrect because continuous contraction (tetanus) requires sustained high
intracellular calcium, not the absence of it.
Examiner Pearl: Calcium is the definitive intracellular trigger for muscle contraction across all
muscle types. [Cellular Physiology 2025]
Question 6
A neurologist is explaining the propagation of an action potential down an axon to a medical
student. They note that the sudden influx of a specific ion is responsible for the rapid
depolarization phase of the action potential. Which ion is this?
A) Potassium (K+)
B) Sodium (Na+)
C) Calcium (Ca2+)
Verified Answers
Series:
CrashCourses Professional Study Series
Author:
Dr Z. Moomba, MBChB, MRCPsych | BethelWellness Ltd
Exam Target:
ATI TEAS 7
Year:
2025/2026
Format:
55 Questions with Verified Answers and Rationales
>
Author's Note:
This document is an original work produced for the CrashCourses Professional Study Series.
Clinical questions and professional scenarios were composed by Dr Z. Moomba based on current
exam objectives, published guidelines, and evidence-based sources (2024–2025). All patient
names, ages, and case details are fictional. Any resemblance to existing published Q&A banks is
coincidental. For personal study use only — not for reproduction or redistribution.
SECTION A — FOUNDATIONS
Question 1
A 45-year-old patient presents to the clinic with a laceration on the anterior surface of their
forearm, distal to the antecubital fossa. Based on anatomical terminology, which of the following
best describes the location of this wound?
A) On the back of the arm, closer to the shoulder than the elbow.
B) On the front of the lower arm, closer to the wrist than the elbow.
C) On the front of the lower arm, further away from the shoulder than the elbow crease.
D) On the back of the lower arm, near the wrist joint.
,Answer: C
Rationale:
The anterior surface refers to the front of the body, and "distal to the antecubital fossa" means
further away from the origin of the limb (shoulder) than the elbow crease.
The defining feature here is understanding "anterior" (front) and "distal" (further from the point of
attachment).
Option B is tempting but "closer to the wrist than the elbow" makes assumptions about the exact
midpoint; "further away from the shoulder than the elbow crease" is the strict translation of "distal
to the antecubital fossa".
Examiner Pearl: Always relate distal and proximal to the limb's point of attachment to the trunk.
[ATI TEAS Science Foundations 2025]
Question 2
During an intense workout, a healthy 28-year-old begins to sweat profusely. As their internal body
temperature rises, thermoreceptors in the skin send signals to the hypothalamus, which triggers
vasodilation and sweating to cool the body down. This process is an example of which of the
following?
A) Positive feedback loop
B) Negative feedback loop
C) Feedforward mechanism
D) Cellular respiration
Answer: B
Rationale:
A negative feedback loop works to reverse a change in a controlled condition, bringing the body
back to its normal set point (homeostasis).
The hallmark of negative feedback is the reversal of the initial stimulus (high temperature is
countered by cooling mechanisms).
Positive feedback is a common distractor, but it amplifies a stimulus (like oxytocin in childbirth)
rather than reversing it.
Examiner Pearl: 99% of homeostatic mechanisms in the human body rely on negative feedback.
[Guyton & Hall Physiology 2024]
,Question 3
A patient sustains a severe burn that destroys the epidermis and dermis, reaching the
subcutaneous tissue, but they report feeling no pain at the center of the burn. Which structural
component of the integumentary system has been destroyed to cause this lack of sensation?
A) Melanocytes
B) Stratum corneum
C) Sebaceous glands
D) Nerve endings
Answer: D
Rationale:
Sensory nerve endings and receptors responsible for detecting pain, temperature, and touch are
located primarily in the dermis.
The destruction of the dermis in a full-thickness (third-degree) burn destroys these nerve
endings, leading to a painless wound center.
Melanocytes (Option A) are in the stratum basale of the epidermis and produce pigment, playing
no direct role in pain sensation.
Examiner Pearl: Third-degree burns are often painless locally because the dermal sensory
receptors are obliterated. [Burn Care Guidelines 2025]
Question 4
A 65-year-old postmenopausal woman is diagnosed with osteoporosis, a condition characterized
by a decrease in bone density. Which type of bone cell is overly active relative to its counterpart in
this condition?
A) Osteoblasts
B) Osteoclasts
C) Osteocytes
D) Chondrocytes
Answer: B
Rationale:
Osteoclasts are responsible for bone resorption (breaking down bone tissue), releasing minerals
like calcium into the blood.
, In osteoporosis, the resorptive activity of osteoclasts outpaces the bone-forming activity of
osteoblasts, leading to weakened bones.
Osteoblasts (Option A) build bone; if they were overly active, bone density would increase, not
decrease.
Examiner Pearl: Remember "Clasts Consume, Blasts Build" to quickly differentiate these bone cell
functions. [TEAS Bone Physiology 2025]
Question 5
During a laboratory experiment observing skeletal muscle contraction, an injection of a chemical
that blocks the release of calcium ions from the sarcoplasmic reticulum is administered. What will
be the immediate physiological effect on the muscle fiber?
A) Myosin heads will bind to actin more firmly.
B) ATP production in the mitochondria will cease immediately.
C) Tropomyosin will remain covering the myosin-binding sites on actin.
D) The muscle fiber will undergo continuous, sustained tetanic contraction.
Answer: C
Rationale:
Calcium ions bind to troponin, causing a conformational change that moves tropomyosin away
from the myosin-binding sites on actin, allowing cross-bridge formation.
Without calcium release, tropomyosin blocks the binding sites, making muscle contraction
impossible according to the sliding filament theory.
Option D is incorrect because continuous contraction (tetanus) requires sustained high
intracellular calcium, not the absence of it.
Examiner Pearl: Calcium is the definitive intracellular trigger for muscle contraction across all
muscle types. [Cellular Physiology 2025]
Question 6
A neurologist is explaining the propagation of an action potential down an axon to a medical
student. They note that the sudden influx of a specific ion is responsible for the rapid
depolarization phase of the action potential. Which ion is this?
A) Potassium (K+)
B) Sodium (Na+)
C) Calcium (Ca2+)
