Question Question 1 of 32 3.0/ 3.0 Points The humerus fits into what at the shoulder? A.acetabulum B.clavicle C.acromion process D.glenoid cavity E.olecranon process Question 2 of 32 3.0/ 3.0 Points What two hormones are involved in regulating the blood calcium level? A.calcitonin and renin B.renin and aldosterone C.renin and PTH D.aldosterone and PTH E.PTH and calcitonin Question 3 of 32 3.0/ 3.0 Points How many vertebrae are there? A.5 B.10 C.18 D.24 E.33 Question 4 of 32 3.0/ 3.0 Points Which function of the skeletal system requires the leg bones to be extremely strong? A.They support the entire body. B.They protect soft body parts. C.They produce blood cells. D.They store minerals and fat. E.They permit flexible body movement. Question 5 of 32 3.0/ 3.0 Points Which bone is part of the pectoral girdle? A.clavicle B.radius C.ulna D.carpals E.manubrium Question 6 of 32 3.0/ 3.0 Points What is the name of the small gap that separates the axon terminal of a nerve from the sarcolemma? A.T tubule B.sliding filament C.synaptic cleft D.synaptic vesicle E.sarcoplasmic reticulum Question 7 of 32 3.0/ 3.0 Points What ion is responsible for initiating muscle contraction? A.Mg2+ B.Ca2+ C.H+ D.Cl- E.Na+ Question 8 of 32 3.0/ 3.0 Points One sarcomere A.extends from Z line to Z line. B.is composed of many myofibrils. C.contains only actin fibers. D.is composed of many muscle fibers. E.surrounds each muscle in the body. Question 9 of 32 3.0/ 3.0 Points What is found within the intercalated disks of cardiac muscle? A.sarcoplasmic reticulum B.gap junctions C.dense connective tissue D.bone E.myoglobin Question 10 of 32 3.0/ 3.0 Points What is the name of a sudden and involuntary muscular contraction, often accompanied by pain? A.bursitis B.sprain C.strain D.tic E.spasm Question 11 of 32 3.0/ 3.0 Points Of the three types of muscle tissue, which is not striated? A.smooth muscle B.cardiac muscle C.skeletal muscle D.skeletal and smooth lack striations E.cardiac and smooth lack striations Question 12 of 32 3.0/ 3.0 Points The cerebrum is associated with the A.two lateral ventricles. B.third ventricle. C.fourth ventricle. D.posterior ventricle. E.anterior ventricle. Question 13 of 32 3.0/ 3.0 Points What type of memory does language depend upon? A.short-term B.semantic C.episodic D.skill E.long term Question 14 of 32 3.0/ 3.0 Points Which of the following is not a function of the nervous system? A.receive sensory input B.cushion and protect soft tissue C.perform information processing D.perform integration E.generate motor output Question 15 of 32 3.0/ 3.0 Points The spinal cord belongs to the A.peripheral nervous system. B.central nervous system. C.axial nervous system. D.appendicular nervous system. E.none of these. Question 16 of 32 3.0/ 3.0 Points Long term use of heroin results in which set of symptoms? A.weight gain, poor cognitive performance, irritability B.cardiac and/or respiratory arrest, sudden death C.apathy, euphoria, hallucinations D.addiction, hepatitis, HIV/AIDS, various bacterial infections E.anxiety, jitters, insomnia, headaches Question 17 of 32 3.0/ 3.0 Points Which of the following is part of the limbic system? A.spinal cord B.primary somatosensory area C.amygdala D.ret
icular formation E.cerebellum Question 18 of 32 3.0/ 3.0 Points Which disorder of the eye is due to the cornea or lens being uneven resulting in a fuzzy image? A.astigmatism B.glaucoma C.color blindness D.nearsightedness E.farsightedness Question 19 of 32 3.0/ 3.0 Points The utricle is especially sensitive to what type of movements? A.back and forth B.up and down C.standing upside D.spinning around E.bending over Question 20 of 32 3.0/ 3.0 Points Which structure in the eye refracts and focuses light rays? A.lens B.humors C.cone cells D.retina E.pupil Question 21 of 32 3.0/ 3.0 Points The summing up of nerve signals by _____________________ is called __________________. A.the reticular activating system, perception B.the cerebral cortex, sensation C.sensory receptors, sensation D.the cerebral cortex, perception E.sensory receptors, integration Question 22 of 32 3.0/ 3.0 Points What type of exteroceptors are located in the ear? A.mechanoreceptors B.chemoreceptors C.photoreceptors D.thermoreceptors E.none of these Question 23 of 32 3.0/ 3.0 Points Why does wave summation occur? A.Muscle fibers have been allowed to fully relax. B.A large amount of time elapses between stimulations. C.Muscle fibers are partially contracted when the next stimulus arrives. D.Muscle twitches are not yet overlapping. Question 24 of 32 3.0/ 3.0 Points In the lab, a researcher finds that the threshold stimulus to induce an action potential in a muscle fiber’s sarcolemma was 3.0 volts. Which of the following would result in muscle tension? A.1.0 volt B.2.0 volts C.3.0 volts D.4.0 volts E.3.0 volts and 4.0 volts Question 25 of 32 3.0/ 3.0 Points A motor unit is defined as _______. A.a single neuron and a single muscle fiber B.a nerve and a muscle C.the axon terminals of a single motor neuron and all of the muscle fibers that it stimulates D.a single muscle fiber and all its axon terminals Question 26 of 32 3.0/ 3.0 Points When wave summation occurs, _______. A.individual muscle twitches are separated B.the muscle force generated decreases C.the muscle fiber has received a single stimulus event D.the muscle force generated increases Question 27 of 32 3.0/ 3.0 Points Which of the following is NOT a phase of a muscle twitch? A.contraction phase B.shortening phase C.relaxation phase D.latent period Question 28 of 32 3.0/ 3.0 Points Contraction of a skeletal muscle that results from a single stimulus is called a ________. A.contraction phase B.twitch C.motor unit D.tetanus Question 29 of 32 3.0/ 3.0 Points Which of the following describes the relaxation phase? A.The sarcomeres are increasing in length, and the force generated increases. B.The sarcomeres are increasing in length, and the force generated decreases. C.The sarcomeres are decreasing in length, and the force generated increases. D.The sarcomeres are decreasing in length, and the force generated decreases. Part 6 of 7 – 0.0/ 8.0 Points Answer the following question in your own words without using any resources. Your answer should be written in complete sentences using correct grammar, spelling, and terminology. Question 30 of 32 0.0/ 4.0 Points Briefly describe “wave summation.” Question 31 of 32 0.0/ 4.0 Points Briefly describe “treppe.”