AP Biology : Systems Physiology

Study concepts, example questions & explanations for AP Biology

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Example Questions

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Example Question #531 : Systems Physiology

Which of the following hormones is not released by the anterior pituitary gland?

Possible Answers:

Oxytocin

Prolactin

Growth hormone (GH)

Thyroid-stimulating hormone (TSH)

Correct answer:

Oxytocin

Explanation:

The anterior pituitary is responsible for releasing a large number of hormones; however, oxytocin is released by the posterior pituitary. Two of oxytocin's most important functions include stimulating uterus contractions and stimulating milk production by the mammary glands. 

Prolactin stimulates milk release from the mammary glands.

Thyroid-stimulating hormone stimulates the release of hormones from the thyroid gland.

Growth hormone stimulates the growth of bones and stimulates the liver to release insulin-like growth factors.

It is important to note that at least one hormone from the hypothalamus is used to regulate each of the hormones released by the anterior pituitary—for example, the anterior pituitary gland will only release prolactin if the hypothalamus releases prolactin-releasing hormone. 

Example Question #532 : Systems Physiology

Chemical messengers released in the blood to stimulate or inhibit the function of another organs are known as __________.

Possible Answers:

platelets

second messengers

hormones

enzymes

electrolytes

Correct answer:

hormones

Explanation:

A hormone is a chemical formed in one organ and carried by the blood to stimulate or inhibit the function of another organ.

Enzymes are protein molecules that carry out catalytic functions. Electrolytes are simply ions dissolved in solution. Second messengers are relay molecules between a signal and its ultimate effect, such as the molecules that carry signals from the cell membrane to the nucleus to affect transcription. Platelets are cell fragments in the blood that help form clots to heal injuries.

Example Question #533 : Systems Physiology

Which of the following is produced by the pituitary gland?

Possible Answers:

Estrogen

Follicle-stimulating hormone

Testosterone

Insulin

Epinephrine

Correct answer:

Follicle-stimulating hormone

Explanation:

The hormones secreted by the pituitary gland are FLAT PEG: Follicle-stimulating hormone, luteinizing hormone, adrenocorticotropic hormone, thyroid-stimulating hormone, prolactin, endorphins, and growth hormone. Testosterone is produced in the testes in males, and in the adrenal gland in both males and females. Insulin is produced by the pancreas. Estrogen is produced by the ovaries in females, and in the adrenal gland in both males and females.

Example Question #1 : Understanding The Brain And Brain Structures

Which of the following is a not a function of the medulla oblongata?

Possible Answers:

Control vomiting reflexes

Control breathing rate

Control speech patterns

Control blood pressure

Control cardiac rate

Correct answer:

Control speech patterns

Explanation:

The medulla oblongata is in the lower half of the brainstem. It controls a variety of functions, mostly involuntary and essential. Heart beat, breathing, and blood pressure are controlled in the medulla oblongata, as is the vomiting reflex.

Speech is controlled by Broca's area, which is located in the frontal lobe of the cerebrum.

Example Question #534 : Systems Physiology

What is the primary function of the occipital lobe?

Possible Answers:

Integrating tactile input

Conscious thought

Integrating auditory input

Integrating visual input

Correct answer:

Integrating visual input

Explanation:

Each answer corresponds to one lobe of the cerebrum. The frontal lobe is responsible for conscious thought, as well as many other functions. The parietal lobe is responsible for integrating tactile information. The temporal lobe has the functions of interpreting smell and sound. The occipital lobe is associated with processing visual information.

Example Question #535 : Systems Physiology

What is the fluid in the anterior chamber of the eye called?

Possible Answers:

Hippocratic humor

Galen humor

All of these refer to the same structure

Aqueous humor

Vitreous humor

Correct answer:

Aqueous humor

Explanation:

The eye is divided into two chambers by the lens: the anterior and posterior chambers. The anterior chamber is filled with aqueous humor, while the posterior chamber is filled with vitreous humor. Aqueous humor nourishes the eye and maintains intraocular pressure. Aqueous humor is also important in the refraction of light, which allows humans to distinguish clear images and colors.

Hippocratic and Galen humor do not exist. Hippocrates and Galen were two ancient physicians who would use the four humors (yellow bile, black bile, phlegm, and blood) to diagnose and treat patients.

Example Question #1 : Understanding The Brain And Brain Structures

A patient is taken to the hospital after suffering severe head trauma. He is unconscious for two days before waking up. Upon standing, the patient finds he has moderate trouble walking straight and has difficulty maintaining his balance.

Based on these symptoms, what part of the patient's brain do you suspect was damaged in the accident?

Possible Answers:

The medulla oblongata

The cerebellum

The hypothalamus

The amygdala

The cerebrum

Correct answer:

The cerebellum

Explanation:

The cerebellum is mainly responsible for fine tuning the motions of the body, including balance and coordination. As a result, damage to this region would cause difficulty walking straight and maintaining balance. 

Example Question #5 : Understanding The Brain And Brain Structures

Unlike the spinal cord, the brain mainly has grey matter on the __________ and white matter on the __________

Possible Answers:

outermost layer . . . inner layer

left half . . . right half

right half . . . left half

inner layer . . . outermost layer

Correct answer:

outermost layer . . . inner layer

Explanation:

Unmyelinated nervous system components make up grey matter, while myelinated axons make up white matter. The cerebral cortex on the surface of the brain contains unmyelinated neural tissue, namely the cell bodies of neurons in the central nervous system. This region is rich in connections. Below its surface lie many myelinated axon tracts to inner nuclei, the cerebellum, other areas of the cortex, and the spinal cord.    

Example Question #536 : Systems Physiology

Please complete the following statement.

The presence of __________ in the brain indicates a modification to __________.

Possible Answers:

the corpus callosum. . . circulation patterns

white matter. . . electro-chemical gradients

folds. . . surface-area-to-volume ratios

gray matter. . . sunlight exposure

multiple lobes. . . surface-area-to-volume ratios

Correct answer:

folds. . . surface-area-to-volume ratios

Explanation:

Folds are present in the human brain due to the rapid evolution of brain-related tasks while the skull shape and size remained relatively constant; therefore, folds are present as modifications to limited surface-area-to-volume ratios in the skull cavity.

Example Question #537 : Systems Physiology

Which of the following is the best explanation for why we have a "blind spot?"

Possible Answers:

None of the choices are true

The optic nerve exits the optic disc through the blind spot

There are both rods and cones present, but they do not contain opsins

There are only rods in the blind spot, but no cones

There are only cones in the blind spot, but no rods

Correct answer:

The optic nerve exits the optic disc through the blind spot

Explanation:

In the blind spot, there is a lack of photoreceptors as the optic nerve exits the optic disk. We normally overcome this automatically when our brains use the information of the surrounding visual field and "fills in" the blind spot. 

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