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The humerus articulates proximally with the clavicle
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An age-related skeletal disease that is characterized by loss of bone mineral density and increased bone fragility is
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A&P 04 (2 of 4)
Study Guide
| Question | Answer |
|---|---|
| The humerus articulates proximally with the clavicle | False |
| An age-related skeletal disease that is characterized by loss of bone mineral density and increased bone fragility is | Osteoporosis |
| Which of the following is not a characteristic of the diaphysis | Provides a bulbous shape for attachment of muscle |
| One similarity between the structures of the foot and hand is the equivalent degrees of movement of both the thumb and the big toe. | False |
| The cells responsible for active erosion of bone minerals are called | Osteoclasts |
| Which structures are unique to the fetal skull and provide additional space for molding the head shape as the baby passes through the birth canal? | Fontanels |
| Calcification of the organic bone matrix occurs when | Complex calcium salts are deposited in the matrix |
| Which of the following may cause skeletal variations | All of the above may cause skeletal variations (Inadequate supply of calcium and vitamin D, Mechanical stress, Age) |
| During childbirth, a baby passes through an imaginary plane called the | Pelvic outlet |
| Which of the following is not one of the primary functions performed by bones | Hormonal production |
| After the age of 50, the density of bone | Decreases slowly because of a shift in the remodeling activity |
| The humerus articulates proximally with the | Scapula |
| The cell organelles that synthesize organic matrix substances in bone formation are | Endoplasmic reticulum and Golgi apparatus |
| Because of how the clavicle articulates with the scapula, all shoulder movements involve the sternoclavicular joint | True |
| In bone growth, the medullary cavity is enlarged because of the activity of | Osteoclasts |
| An example of a hinge joint is(are) the | Interphalangeal joints |
| Which of the following is not an end-product of the breakdown of ATP | All of the above are end-products of the breakdown of ATP (An inorganic phosphate, Energy that can be used in muscle contraction, ADP) |
| Which of the following proteins found in myofilaments contains the cross-bridges | Myosin |
| The strength of a muscle contraction is influenced by the | All of the above are correct (amount of load, initial length of muscle fibers, recruitment of motor units) |
| The protein molecule that has heads jutting out for cross-bridging is | myosin |
| Most body movements are _____ contractions | Isotonic |
| The rotator cuff muscles and tendons form a cufflike arrangement around the _____ joint | Shoulder |
| Which structure functions to temporarily store calcium ions | Sarcoplasmic reticulum |
| All of the following are characteristics of smooth muscle except | Thin and thick filaments are aligned in sarcomeres like skeletal muscles |
| White fibers are also called _____ fibers | Fast |
| Stretching the foot down and back and pointing the toe is called | Plantar flexion |
| The ability of muscle cells to respond to nerve stimuli is called | Irritability |
| Physiological muscle fatigue may be caused by | All of the above ( a relative lack of ATP, high levels of lactate, failure of the sodium-potassium pumps) |
| Tilting the foot upward, decreasing the angle between the top of the foot and the front of the leg, is called | Dorsiflexion |
| A contraction in which the tension within the muscle remains the same but the length changes is called a(n) _____ contraction | Isotonic |
| Acetylcholine is in the same class of neurotransmitters as | None of the above |
| No impulse can be sent through a neuron | During the absolute refractory period |
| The only ion(s) that can diffuse across a neuron’s membrane when the neuron is at rest is (are) | Potassium |
| Which is true of an action potential | The outside of the plasma membrane is negatively charged, and the inside is positively charged |
| Which of the following is not used by the body as a neurotransmitter | Peroxide |
| Within the nervous system, coding for the strength of a stimulus is accomplished through | The frequency of nerve impulses |
| Which neuron could transmit a nerve impulse the fastest | A large-diameter neuron with myelin |
| The fastest nerve fibers in the body can conduct impulses up to approximately _____ meters per second | 130 |
| A slight shift away from the resting membrane potentials in a specific region of the plasma membrane is called a _____ potential | Local |
| Stimulus-gated channels open in response to | Sensory stimuli |
| A synapse consists of | All of the above ( a synaptic knob, a synaptic knob, the plasma membrane of a postsynaptic neuron) |
| Severe depression can be caused by a deficit in certain brain synapses of | Neuropeptides |
| Which of the following is not one of the main chemical classes of neurotransmitters | Triglycerides |
| Which of the following is true of spatial summation | Neurotransmitters released simultaneously from several presynaptic knobs converge on one postsynaptic neuron |
| A synaptic knob would be located on a(n) | Axon |
| A mixed nerve is one that | Carries both sensory and motor fibers |
| The cerebellum performs all of the following functions except | Controls cardiac function |
| If the ventral nerve root of a spinal nerve were destroyed, a person would lose _____ related to that pathway | Willed movement |
| All of the following cranial nerves are involved in proprioception except the | Vagus |
| Audition is a function of the _____ lobe | Temporal |
Created by:
Christina Schneck