Øveprøve i anatomi og fysiologi

Alle 15 spørgsmål i overblik

Vil du hellere læse, før du går i gang? Alle spørgsmål i smagsprøven står herunder. Svar og forklaringer er foldet sammen, indtil du åbner dem.

1. 1. Which of the following is classified as a long bone?

   • A. The femur
   • B. The patella
   • C. The sternum
   • D. The carpal bones of the wrist
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   Svar: A. The femur

   Long bones are longer than they are wide and are built as a shaft, the diaphysis, capped by two ends called epiphyses. The patella is a sesamoid bone formed inside a tendon, the sternum is flat, and the carpals are short bones roughly as wide as they are long.

2. 2. The elbow is an example of which type of joint?

   • A. Ball and socket
   • B. Hinge
   • C. Pivot
   • D. Saddle
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   Svar: B. Hinge

   A hinge joint allows movement in one plane only, so the elbow bends and straightens but does not rotate at that joint. Ball and socket joints like the shoulder and hip move in many planes, while the pivot joint between the first two vertebrae lets the head turn side to side.

3. 3. According to the sliding filament model, why does a muscle fiber shorten during contraction?

   • A. The actin filaments shorten
   • B. The myosin filaments shorten
   • C. Actin filaments slide along myosin filaments, pulling the ends of each sarcomere closer together
   • D. New, shorter sarcomeres replace the old ones
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   Svar: C. Actin filaments slide along myosin filaments, pulling the ends of each sarcomere closer together

   Calcium uncovers the binding sites on actin, myosin heads attach and pivot, and the thin filaments are pulled toward the center of the sarcomere. Neither filament changes length; the sarcomere shortens because its Z discs are dragged closer, and thousands of sarcomeres in series make the whole fiber shorten.

4. 4. Depolarization during a neuron's action potential is caused mainly by:

   • A. Sodium ions rushing into the cell
   • B. Potassium ions rushing into the cell
   • C. Sodium ions being pumped out of the cell
   • D. Calcium ions leaving the cell
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   Svar: A. Sodium ions rushing into the cell

   When the membrane reaches threshold, voltage-gated sodium channels open and sodium floods in down its gradient, flipping the inside of the cell from negative to positive. Repolarization then comes from potassium leaving the cell, and the sodium-potassium pump restores the original gradients afterward.

5. 5. Which of the following happen when the sympathetic division of the autonomic nervous system is activated?

   Vælg alle, der passer.

   • A. Heart rate increases
   • B. The pupils dilate
   • C. Digestive activity speeds up
   • D. The airways in the lungs widen
   • E. Salivation increases
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   Svar: A. Heart rate increases, B. The pupils dilate, D. The airways in the lungs widen

   The sympathetic division prepares the body for exertion: it drives the heart faster, opens the pupils to let in more light and widens the bronchioles so more air moves per breath. Digestion and salivation are parasympathetic rest and digest activities, and both are turned down during a sympathetic response, which is why stress causes a dry mouth.

6. 6. Which cranial nerve carries most of the parasympathetic output to the heart, lungs and digestive tract?

   • A. The trigeminal nerve (CN V)
   • B. The facial nerve (CN VII)
   • C. The vagus nerve (CN X)
   • D. The hypoglossal nerve (CN XII)
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   Svar: C. The vagus nerve (CN X)

   The vagus nerve wanders from the brainstem down into the thorax and abdomen, slowing the heart and stimulating digestion. The trigeminal nerve handles facial sensation and chewing, and the hypoglossal nerve moves the tongue, so neither reaches the organs in question.

7. 7. Complete the sentence.

   Antidiuretic hormone is produced in the hypothalamus and released into the blood by the _____, and it makes the kidney reabsorb more water.

   Muligheder for felt 1: anterior pituitary, posterior pituitary, adrenal medulla, thyroid gland

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   Svar: posterior pituitary

   The posterior pituitary does not manufacture hormones. It stores and releases antidiuretic hormone and oxytocin, which are made by hypothalamic neurons whose axons run down into it, while the anterior pituitary makes its own hormones such as TSH, ACTH and growth hormone.

8. 8. Which hormone raises the level of calcium in the blood?

   • A. Calcitonin
   • B. Parathyroid hormone
   • C. Thyroxine (T4)
   • D. Growth hormone
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   Svar: B. Parathyroid hormone

   Parathyroid hormone pulls calcium out of bone, makes the kidney reabsorb more calcium, and activates vitamin D so the gut absorbs more from food. Calcitonin, released by the thyroid, does the opposite and moves calcium back into bone.

9. 9. Which hormone from the adrenal cortex makes the kidney reabsorb sodium, so that water follows and blood pressure rises?

   • A. Cortisol
   • B. Aldosterone
   • C. Epinephrine
   • D. Antidiuretic hormone
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   Svar: B. Aldosterone

   Aldosterone is the end of the renin-angiotensin-aldosterone chain that fires when blood pressure or sodium falls. It acts on the distal tubule and collecting duct to hold on to sodium and dump potassium, and water follows the sodium back into the blood.

10. 10. Which structure normally sets the rate of the heartbeat?

    • A. The atrioventricular (AV) node
    • B. The sinoatrial (SA) node
    • C. The bundle of His
    • D. The Purkinje fibers
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    Svar: B. The sinoatrial (SA) node

    The sinoatrial node in the wall of the right atrium depolarizes on its own faster than any other part of the conduction system, so it acts as the pacemaker. The signal then passes to the AV node, which delays it long enough for the atria to empty, before the bundle of His and Purkinje fibers spread it through the ventricles.

11. 11. Which of the following statements about blood are correct?

    Vælg alle, der passer.

    • A. Plasma is mostly water
    • B. Red blood cells carry oxygen bound to hemoglobin
    • C. Platelets are cell fragments rather than whole cells
    • D. Mature red blood cells contain a nucleus
    • E. White blood cells are the main oxygen carriers
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    Svar: A. Plasma is mostly water, B. Red blood cells carry oxygen bound to hemoglobin, C. Platelets are cell fragments rather than whole cells

    Plasma is roughly 90 percent water carrying proteins, ions and nutrients, and hemoglobin inside red blood cells does the oxygen carrying. Platelets are fragments broken off large megakaryocytes in the bone marrow, mature red blood cells eject their nucleus to make room for hemoglobin, and white blood cells handle defense rather than transport.

12. 12. Complete the sentence.

    Breathing is controlled by centers in the brainstem, and the strongest everyday signal to breathe faster and deeper is a rise in blood _____.

    Muligheder for felt 1: oxygen, carbon dioxide, glucose, calcium

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    Svar: carbon dioxide

    Carbon dioxide reacts with water to form carbonic acid, so a rise in carbon dioxide shows up as a rise in hydrogen ions that central chemoreceptors in the medulla detect. Low oxygen is only a backup drive, sensed by peripheral chemoreceptors in the carotid and aortic bodies once oxygen falls a long way.

13. 13. In a healthy kidney, which of the following pass out of the blood and into the filtrate at the glomerulus?

    Vælg alle, der passer.

    • A. Water
    • B. Glucose
    • C. Sodium ions
    • D. Red blood cells
    • E. Large plasma proteins such as albumin
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    Svar: A. Water, B. Glucose, C. Sodium ions

    The filtration membrane sorts by size and charge: water, ions and small molecules like glucose pass through easily, while blood cells and large plasma proteins are held back in the capillary. Glucose is then completely reabsorbed further along the tubule, which is why it does not show up in normal urine.

14. 14. Complete the sentence.

    Protein digestion begins in the stomach, where the enzyme _____ works in a strongly acidic environment.

    Muligheder for felt 1: salivary amylase, pepsin, pancreatic lipase, bile salts

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    Svar: pepsin

    Chief cells release the inactive form pepsinogen, and stomach acid converts it into pepsin, which only works at a low pH. Pancreatic enzymes finish the job in the small intestine, which is also where nearly all nutrient absorption happens across the villi and microvilli.

15. 15. In a negative feedback loop, the body's response to a change in a variable:

    • A. Pushes the variable further in the same direction
    • B. Reverses the change and moves the variable back toward its set point
    • C. Has no measurable effect on the variable
    • D. Permanently resets the variable to a new value
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    Svar: B. Reverses the change and moves the variable back toward its set point

    Negative feedback opposes the change that triggered it, which is how body temperature, blood glucose and blood pressure stay in a narrow range: a rising core temperature triggers sweating and skin vessel dilation until the temperature falls again. Positive feedback is the rarer opposite, amplifying a change until an endpoint is reached, as in blood clotting and labor contractions.

Hvad et kursus i anatomi og fysiologi faktisk tester

Anatomi og fysiologi er to fag, der undervises som ét. Anatomi er kortet: navne, placeringer, holdepunkter, hvilken struktur der ligger ved siden af hvilken. Fysiologi er maskinen: hvordan de strukturer virker, hvad der sætter dem i gang, og hvad der sker længere nede i kæden, når en del svigter. De fleste kurser tester begge dele i samme spørgsmål, og derfor går ren udenadslære af navne i stå omkring den første eksamen.

De eksamensspørgsmål, der skiller de studerende, er næsten altid mekanismespørgsmål. Ikke hvad aldosteron gør, men hvorfor blodtrykket stiger, når det frigives. Ikke hvor sinusknuden sidder, men hvad der sker med hjerteslaget, hvis den holder op med at fyre. Kan du følge kæden fra udløser til virkning, kan du som regel ræsonnere dig frem til svaret, selv når formuleringen er ukendt.

At tænke i systemer slår at lære lister udenad, fordi systemerne hele tiden henviser til hinanden. Nyren er der, hvor et hormon gør sit arbejde. Vejrtrækningsfrekvensen sættes af et center i nervesystemet, der reagerer på en ændring i blodets kemi. Kalkniveauet forbinder knogler, tarm og nyre gennem ét hormon. Læser du det som én sammenhængende historie, holdes hvert faktum på plads af flere andre i stedet for at svæve alene.

Sådan bruger du smagsprøven

De 15 spørgsmål herunder er spredt ud over de systemer, et førsteårskursus dækker, cirka et til tre per system, og de blander de spørgsmålsformater, eksamener i anatomi og fysiologi bruger: klassisk multiple choice, vælg alle der passer og udfyld det tomme felt. Tag det hele i ét stræk uden noter, cirka 90 sekunder per spørgsmål, så resultatet fortæller dig noget ærligt.

Læs derefter hver eneste forklaring, også dem til de spørgsmål, du svarede rigtigt på. Hver forklaring nævner mekanismen og ikke bare svaret, så den fungerer også som en kort repetition. Et gæt, der tilfældigvis ramte, er også værd at læse om, for det kan du ikke gentage til en eksamen.

Behandl hvert forkert svar som et signal om et system, ikke om ét enkelt faktum. Misser du spørgsmålet om aldosteron og spørgsmålet om filtration, peger det på nyren og væskebalancen som en enhed, du skal repetere. Misser du spørgsmålet om aktionspotentialet og spørgsmålet om det autonome nervesystem, peger det på kapitlet om nervesystemet. Læs efter det system, der svigtede, og kom så tilbage og tag prøven igen.

Sådan bygger StudyPDF fulde øveprøver ud fra dine egne noter

Femten spørgsmål kan vise dig, hvilket system der er svagest. De kan ikke dække de bestemte muskler, hormoner og baner, som din underviser har valgt at lægge vægt på, og generiske spørgsmålsbanker har det med at drive væk fra det kursus, du faktisk får karakter i.

StudyPDF gør det modsat. Du uploader dine egne forelæsningsslides, kapitler fra lærebogen eller noter fra timerne, og Bo, studieagenten, bygger øveprøver, flashcards og studieguides ud fra præcis det materiale. Hvert spørgsmål bygger på dine sider, og hver forklaring henviser til hvor svaret kommer fra, så du kan springe direkte til kilden når noget er uklart.

Du kan lave nye prøver så tit du vil, holde dem på ét enkelt system som hormoner eller nyrer før en delprøve, og følge med i hvilke begreber du bliver ved med at ramme forkert på tværs af forsøg. Gratis at komme i gang.