TEAS Science Practice Test: 18 Questions in 20 Minutes

Learn paths, not lists of names

Most people prepare for the anatomy questions by memorising terms, and most people find the terms will not stay put. The material is genuinely large, and a flat list of a hundred structures has no internal logic to hold it together.

Paths do. Trace a substance through a system once, carefully, and the names attach to positions along a route rather than floating free. Three paths carry the majority of what a nursing entrance exam asks about these systems.

• Blood through the heart: right atrium → tricuspid valve → right ventricle → pulmonary semilunar valve → pulmonary trunk → lungs → pulmonary veins → left atrium → mitral valve → left ventricle → aortic semilunar valve → aorta.

• Air to the exchange surface: nose → pharynx → larynx → trachea → primary bronchi → bronchial tree → bronchioles → terminal bronchioles → respiratory bronchioles → alveolar ducts → alveoli.

• Food through the canal: mouth → pharynx → esophagus → stomach → small intestine → large intestine → anus.

Once you can say each path out loud, a question naming any single structure becomes answerable by locating it on the route. That is a much smaller thing to hold in your head than the list it replaces.

Arteries and veins are about direction, not oxygen

This is the most reliably exploited misconception in cardiovascular questions, and it is worth getting exactly right. An artery carries blood away from the heart. A vein carries blood toward the heart. Neither definition mentions oxygen.

In the systemic circulation the two happen to line up — arteries carry oxygen-rich blood out, veins bring oxygen-poor blood back — and that coincidence is where the misconception comes from. The pulmonary circulation breaks it. The pulmonary trunk is an artery carrying oxygen-poor blood to the lungs; the pulmonary veins are veins carrying oxygen-rich blood back to the left atrium.

So a question asking which vessel carries oxygenated blood to the heart has exactly one answer, and it is a vein. If your instinct says otherwise, the instinct is running on the coincidence rather than the definition.

Two zones, and why the distinction answers questions

The respiratory tract splits into a conducting zone and a respiratory zone, and knowing which zone a structure belongs to answers more questions than knowing its name.

The conducting zone runs from the nose through the terminal bronchioles. Its jobs are to provide a route for air, remove debris and pathogens, and warm and humidify what comes in. It exchanges no gas at all.

The respiratory zone begins at the respiratory bronchioles and takes in the alveolar ducts and alveoli. Gas exchange happens here and only here, across a respiratory membrane about half a micrometre thick.

That thickness is the point. Anything that thickens the barrier — fluid, scarring, inflammation — impairs exchange, which is the mechanism behind a large family of clinical questions you will meet later. A question about a structure in the conducting zone cannot have gas exchange as its answer, which often eliminates two options immediately.

Canal or accessory: the question that sorts the digestive system

The digestive system divides cleanly if you ask one thing: does food physically pass through this?

If yes, it is part of the alimentary canal — mouth, pharynx, esophagus, stomach, small intestine, large intestine, anus. If no, it is an accessory organ contributing secretions from outside the tube: teeth, tongue, salivary glands, gallbladder, liver, pancreas.

The other high-value fact is where absorption happens. The small intestine is where most digestion completes and where most released nutrients cross into blood or lymph; its structure is built to maximise surface area for exactly that. The stomach mainly stores and breaks food down; the large intestine reclaims the water that is left, since about 90 percent of it is already absorbed in the small intestine. Questions about the consequences of losing part of an organ are usually answerable from these functions rather than from clinical knowledge — which is what makes them fair questions on an entrance exam.

Four ideas cover the whole reasoning strand

The scientific-reasoning questions look varied and rest on a very short list. Learn these four and that section stops being a lottery.

• Independent versus dependent variable. The independent variable is what you do; the dependent variable is what you measure. Everything held the same across groups is a controlled variable.

• What a control group is for. It shows what happens without the treatment, so any difference can be attributed to the treatment. It only works if the control is treated identically in every respect except the one being tested.

• Association is not causation. An observational study finds a relationship. It cannot say which way the arrow points, and it cannot rule out a third factor causing both. Causal claims need an experiment that assigns the exposure rather than observing it.

• Falsifiability. A useful hypothesis states in advance what result would show it wrong. Deciding after the fact that whatever happened fits your belief is the commonest failure in this section and in science generally.

Almost every reasoning question is one of these four wearing a different scenario. Identify which one before reading the options, and the options stop being persuasive.

Association versus causation, in the setting you will actually meet it

This one deserves its own treatment because nursing is full of it. A study reports that patients who received a particular intervention recovered faster. Does the intervention work?

Not yet established. Consider what else could produce that result. Patients selected for an intervention are often different from those who were not — healthier, younger, more engaged, with milder disease. Many conditions improve on their own regardless of treatment. Expectation affects reported outcomes. And measurement taken at an extreme tends to look better on repeat simply because extremes are unusual, which is regression to the mean.

None of that means the intervention does not work. It means the study as described cannot separate the intervention's effect from what would have happened anyway. The fix is always the same shape: a comparison group, assigned rather than self-selected, treated identically in every other respect. When a question asks what is missing before concluding something works, that is almost always the answer.

Pacing 20 minutes and reading your report

Eighteen questions in twenty minutes is a little over a minute each, which is comfortable for recall questions and about right for reasoning scenarios. Anatomy questions should take 30 to 40 seconds — if one is taking longer, you are trying to recall a fact instead of locating a structure on a path, and the path is faster.

Do not leave blanks; there is no penalty. On an anatomy question you cannot place, eliminate by zone or by canal-versus-accessory first, which usually removes two options. On a reasoning question, identify which of the four ideas it is testing, and the correct option is normally the most cautious one that the evidence actually supports.

The report splits three ways. Weak anatomy means paths, not flashcards — go back to the first section above. Weak reasoning is the faster repair, and the critical thinking paper drills the same skill at length. Weak method and measurement usually means unit prefixes, which take ten minutes to fix properly. Sign in before you start and your score is saved with a history for this paper alone, so next week's attempt is measured against this one rather than against memory.