Anatomy and Physiology Exam 3.pdf

AP1-EXAM3 - Exam practice questions Human Anatomy and Physiology I (Hillsborough Community College) Studocu is not sponsored or endorsed by any college or university AP1-EXAM3 - Exam practice questions Human Anatomy and Physiology I (Hillsborough Community College) Studocu is not sponsored or endorsed by any college or university Downloaded by Lisette Mercedes (lisettemercedes@icloud.com) lOMoARcPSD|36324660

AP1-Exam 3 Question 1 What is the role of tropomyosin in skeletal muscles? A. Tropomyosin serves as a contraction inhibitor by blocking the actin binding sites on the myosin molecules. B. Tropomyosin is the chemical that activates the myosin heads. C. Tropomyosin is the receptor for the motor neuron neurotransmitter. D. Tropomyosin serves as a contraction inhibitor by blocking the myosin binding sites on the actin molecules. Question 2 What structure in skeletal muscle cells functions in calcium storage? A. intermediate filament network B. sarcoplasmic reticulum C. myofibrillar network D. mitochondria Question 3 Immediately following the arrival of the stimulus at a skeletal muscle cell there is a short period called the ________ period during which the neurotransmitter is released by exocytosis, diffuses across the synaptic cleft, and binds to its receptors. A. relaxation B. contraction C. latent D. refractory Question 4 Which of the following surrounds the individual muscle cell? A. perimysium B. epimysium C. endomysium D. fascicle Question 5 What is the functional unit of a skeletal muscle called? A. the sarcoplasmic reticulum B. a myofibril C. a myofilament D. a sarcomere Downloaded by Lisette Mercedes (lisettemercedes@icloud.com) lOMoARcPSD|36324660

Question 6 In an isotonic contraction, the muscle ________. Answered A. does not change in length but increases tension B. never converts pyruvate to lactate C. rapidly resynthesizes creatine phosphate and ATP D. changes in length and moves the "load" Question 7 Which of the following is the correct sequence of events for muscle contractions? A. neurotransmitter release, motor neuron action potential, muscle cell action potential, release of calcium ions from SR, ATP-driven power stroke B. motor neuron action potential, neurotransmitter release, muscle cell action potential, release of calcium ions from SR, ATP-driven power stroke, sliding of myofilaments C. muscle cell action potential, neurotransmitter release, ATP-driven power stroke, calcium ion release from SR, sliding of myofilaments D. neurotransmitter release, muscle cell action potential, motor neuron action potential, release of calcium ions from SR, sliding of myofilaments, ATP-driven power stroke Question 8 What is a muscle that provides the major force for producing a specific movement called? A. a synergist B. a fixator C. an agonist D. an antagonist Question 9 Which of these is not a way of classifying muscles? A. the type of muscle fibers B. muscle location C. muscle shape D. the type of action they cause Question 10 If a lever operates at a mechanical disadvantage, it means that the ________. A. lever system is useless B. effort is farther than the load from the fulcrum C. load is far from the fulcrum and the effort is applied near the fulcrum D. load is near the fulcrum and the effort is at the distal end Downloaded by Lisette Mercedes (lisettemercedes@icloud.com) lOMoARcPSD|36324660

Question 11 Which of the following is an excitatory neurotransmitter secreted by motor neurons innervating skeletal muscle? A. acetylcholine B. gamma aminobutyric acid C. norepinephrine D. cholinesterase Question 12 The part of a neuron that conducts impulses away from its cell body is called a(n) ________. A. dendrite B. neurolemma C. Schwann cell D. axon Question 13 Which ion channel opens in response to a change in membrane potential and participates in the generation and conduction of action potentials? A. leakage channel B. mechanically gated channel C. ligand-gated channel D. voltage-gated channel Question 14 An impulse from one nerve cell is communicated to another nerve cell via the ________. A. synapse B. effector C. receptor D. cell body Question 15 The term central nervous system refers to the ________. A. brain, spinal cord, and peripheral nerves B. spinal cord and spinal nerves C. peripheral and spinal nerves D. brain and spinal cord Question 16 What are ciliated CNS neuroglia that play an active role in moving the cerebrospinal fluid called? A. astrocytes B. oligodendrocytes C. Schwann cells ! D. ependymal cells Downloaded by Lisette Mercedes (lisettemercedes@icloud.com) lOMoARcPSD|36324660

Question 17 What does the central nervous system use to determine the strength of a stimulus? A. size of action potentials B. type of stimulus receptor C. origin of the stimulus D. frequency of action potentials Question 18 An inhibitory postsynaptic potential (IPSP) is associated with ________. A. lowering the threshold for an action potential to occur B. hyperpolarization C. opening of voltage-regulated channels D. a change in sodium ion permeability Question 19 The arbor vitae refers to ________. A. the pleatlike convolutions of the cerebellum B. cerebellar gray matter C. cerebellar white matter D. flocculonodular nodes Question 20 The brain stem consists of the ________. A. pons, medulla, cerebellum, and midbrain B. cerebrum, pons, midbrain, and medulla C. midbrain only D. midbrain, medulla, and pons Question 21 The subarachnoid space lies between what two layers of meninges? A. dura and epidura B. arachnoid and dura C. arachnoid and epidura D. arachnoid and pia Question 22 A shallow groove on the surface of the cortex is called a ________. A. sulcus B. gyrus C. furrow D. fissure Downloaded by Lisette Mercedes (lisettemercedes@icloud.com) lOMoARcPSD|36324660

Question 23 The central sulcus separates which lobes? A. frontal from parietal B. temporal from parietal C. frontal from temporal D. parietal from occipital Question 24 Ridges of tissue on the surface of the cerebral hemispheres are called ________. A. gyri B. fissures C. sulci D. ganglia Question 25 All of the following are structures of the limbic system except the ________. A. amygdaloid nucleus B. hippocampus C. caudate nucleus D. cingulate gyrus Question 26 The process of linking new facts with old facts already stored in the memory bank is called ________. A. rehearsal B. automatic memory C. Association D. long-term memory Question 27 Which of the following is not a function of the CSF? A. protection from blows B. initiation of some nerve impulses C. nourishment of the brain D. reduction of brain weight Question 28 Which of the following is the mildest consequence of traumatic brain injury? A. hemorrhage B. contusion C. concussion D. swelling Downloaded by Lisette Mercedes (lisettemercedes@icloud.com) lOMoARcPSD|36324660

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