TEAS Science Practice Test #4 3

Question 1

Which of the following describes the concept of "homeostasis"?

Accepted Answer

The maintenance of a stable internal environment despite external changes

Answer

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?

Accepted Answer

Initiate clotting to prevent excessive bleeding

Answer

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?

Accepted Answer

Ball-and-socket joint

Answer

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?

Accepted Answer

Observation → Hypothesis → Experiment → Analysis → Conclusion

Answer

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?

Accepted Answer

Vitamin D

Answer

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.

TEAS Practice Test

TEAS Practice Test

TEAS Science Practice Test #4 3