TEAS Science Practice Test #4 3 — Questions and Answers
Question 1: Which of the following describes the concept of "homeostasis"?
- The body's ability to grow new cells after injury
- The maintenance of a stable internal environment despite external changes (Correct answer)
- The process by which hormones are broken down and eliminated
- The genetic inheritance of traits from parent to offspring
Correct answer: The maintenance of a stable internal environment despite external changes
Homeostasis is the body's ability to maintain a relatively stable internal environment (temperature, pH, blood glucose, etc.) through regulatory feedback mechanisms, despite changes in external conditions.
Question 2: What is the function of platelets (thrombocytes) in the blood?
- Carry oxygen from the lungs to body tissues
- Produce antibodies to fight infection
- Initiate clotting to prevent excessive bleeding (Correct answer)
- Filter toxins from the blood in the liver
Correct answer: Initiate clotting to prevent excessive bleeding
Platelets are small cell fragments in the blood that aggregate (clump together) at the site of a blood vessel injury to form a platelet plug and initiate the coagulation cascade, preventing excessive blood loss.
Question 3: What type of joint allows the greatest range of motion?
- Fibrous joint
- Cartilaginous joint
- Hinge joint
- Ball-and-socket joint (Correct answer)
Correct answer: Ball-and-socket joint
Ball-and-socket joints (like the hip and shoulder) allow movement in multiple planes — flexion, extension, abduction, adduction, and rotation — providing the greatest range of motion of any joint type.
Question 4: Which of the following is the correct sequence of the scientific method?
- Hypothesis → Observation → Experiment → Conclusion
- Observation → Hypothesis → Experiment → Analysis → Conclusion (Correct answer)
- Experiment → Hypothesis → Observation → Analysis
- Conclusion → Observation → Hypothesis → Experiment
Correct answer: Observation → Hypothesis → Experiment → Analysis → Conclusion
The scientific method follows: Observation (noticing a phenomenon) → Hypothesis (forming a testable prediction) → Experiment (testing the hypothesis) → Analysis (interpreting data) → Conclusion (accepting/rejecting the hypothesis). The cycle may repeat.
Question 5: Which vitamin is synthesized by the skin when exposed to sunlight?
- Vitamin A
- Vitamin B12
- Vitamin C
- Vitamin D (Correct answer)
Correct answer: Vitamin D
Vitamin D (specifically D3/cholecalciferol) is synthesized in the skin when ultraviolet B (UVB) rays from sunlight trigger its production from a cholesterol precursor. It is essential for calcium absorption and bone health.
Question 6: Which organ produces bile for fat digestion?
- Pancreas
- Liver (Correct answer)
- Gallbladder
- Stomach
Correct answer: Liver
The liver produces bile, a substance that emulsifies (breaks apart) dietary fats into smaller droplets, increasing the surface area for digestive enzymes to work. Bile is then stored in the gallbladder and released into the small intestine.
TEAS Science Practice Test #4 3
Which of the following describes the concept of "homeostasis"?