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SCI221-01

PHYSIOLOGY

QuestionAnswer
Negative-feedback control system: a) oppose a change b) accelerate a change c) have no effect on the deviation from set point d) establish a new set point a) oppose a change.
Of the 11 major body systems, which is the least involved in maintaining homeostasis? a) circulatory b) endocrine c) lymphatic d) reproductive d) reproductive
shivering to try to raise your body temperature back to normal would be an example of: a) the body trying to maintain homeostasis b) a positive-feedback mechanism c) a negative-feedback mechanism d) both a and c d) both a and c
Unsaturated fats: a) contain all the hydrogen atoms they can hold b) contain only single bonds between carbon atoms c) are usually solids at room temperature d) will kink or bend because of the double bonds between the carbon atoms d) will kink or bed because of the double bonds between the carbon atoms
Which of the following is not true of RNA? a) it contains ribosome sugar b) it contains adenine c) it is composed of smaller molecules called nucleotieds d) all of the above are true of RNA d) all of the above are true of RNA.
A structural lipid found in the cell membrane is a: phospholipid.
DNA: a) is a single strand of nucleotides b) contains the sugar ribosome c) is a double-helix strand of nucleotides d) transports amino acids duing protein synthesis c) is a double-helix strand of nucleotides.
Which lipid is part of vitamin D? a) glycerol b) steroids c) prostaglandinds d) fatty acids c)prostaglandins.
Phagocytosis is an example of: a) exocytosis b) endocytosis c) passive transport d) facilitated diffusion b) endocytosis.
Which of the following statements is true? a) amino acid chains form DNA b) the site of transcription is within the nucleus, whereas the site of translation is in the cytoplasm c) uracil is present in DNA in place of thyamine d) none of the above is true b) the site of transcription is within the nucleus, whereas the site of translation is in the cytoplasm.
Which of the following is not a characteristic of smooth muscles? a) having one nucleus per cell b) having intercalated disks c) composing the walls of the viscera d) usually not being under voluntary control b) having intercalated disks.
Which of the following is not a characteristic of epithelial tissue? a) forms glands that secrete substances into and out of the body b) is important in communication and control c) covers and protects body surfaces d) lines the interior of body cavities b) is important in communication and control.
Which of the following is not a characteristic of skeletal muscles? a) having one nucleus per cell b) being attached to bone c) having striations d) having voluntary or "willed" muscles a) having one nucleus per cell.
The cell organelles that synthesize organic matrix substances in bone formation are: endoplasmic reticulum and golgi apparatus.
Normally, bone loss will begin to exceed bone gain between the ages of _____ years. a) 20 and 25 b) 25 and 30 c) 30 and 35 d) 34 and 40 d) 35 and 40.
Which joint allows for the most movement? ball and socket.
Physiological muscle fatigue may be caused by: a) a relative lack of ATP b) high levels of lactate c) failure of the sodium-potassium pumps d) all of the above d) all of the above.
The type of movement that occurs when the head is dropped to the shoulder, then to the chest, to the other shoulder, and toward the back is: a) rotation b) flexion c) extension d) circumduction d) circumduction.
White fibers are also called _____ fibers. a) fast b) slow c)elongated d)intermediate a) fast.
In terms of function, which is considered an immovable joint? synarthrosis.
Acetylcholine is in the same class of neurotransmitters as: a) serotonin b) histamine c) dopamine d) none of the above d) none of the above.
When an impulse reaches a synapse: a) two nerve fibers come in direct contact b) impulses will pass in either direction c) an electrical spark will jump the gap d) chemical transmitters are released d) chemical transmitters are released.
Which of the following is not used by the body as a neurotransmitter? a) nitric oxide b) acetylcholine c) carbon monoxide d) all ove the above are used by the body as neurotransmitters d) all of the above are used by the body as neurotransmitters.
Which neuron could transmit a nerve impulse the fastest? a) a small-diameter neuron without myelin b) a large-diamteter neuron without myelin c) a large-diameter neuron with myelin d) a small-diameter neuron with myelin c) a large-diameter neuron with myelin
During a relative refractory period: the action potential can be intiated with a strong stimulus.
The brief period during which a local area of an axon's membrane resists re-stimulation is called the _____period. a) refractor b) resting c) repolarization d) action a) refractor.
The fastest nerve fibers in the body can conduct impulses up to approximately _____ meters per second. a) 190 b) 130 c)85 d) 60 b) 130.
Excitatory neurotransmitters are most likely to: a) increase the speed of impulse conduction b) make the cell membrane impermeable c) initiate an action potential d) make the resting potential more negative c) initiate an action potential.
The neurotransmitter(s) that inhibit(s) the conduction of pain impulses is (are): a) norepinephrine b) dopamine c) enkephalins d) acetylcholine c)enkephalins
The active transport mechanism in the plasma membrane that transports sodium and potassium ions in opposite directions and at different rates is the: a) sodium-potassium pump b) ion pump c) chloride channel d) sodium-potassium channel a) sodium-potassium pump.
Created by: Lorrie Oronos
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