FREE AND STUDY GAMES ABOUT PHYSIO LAB EXAM 1

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FREE AND STUDY GAMES ABOUT PHYSIO LAB EXAM 1

Actual Qs and Ans Expert-Verified Explanation

This Exam contains:

-Guarantee passing score -66 Questions and Answers -format set of multiple-choice -Expert-Verified Explanation Question 1: Which of the following factors best describes what would occur with reduced blood flow to the extremities?

Answer:

More blood is available for the heart and brain, and increased stroke volume of the heart.Question 2: Refer to the numbered stages in the image above. At which stages do the channels open and close during an action potential?

Answer:

Stimulus-gated ion channels open voltage gated Na+ channels open voltage gated K+ channels open Voltage gated Na+ channels close Voltage gated K+ channels close Question 3: The electrical current from the bar electrode directly caused action potentials to be

created in a/the:

Answer:

Nerve of the hand

Question 4: What control centers do chemoreceptors send signals to when stimulated?

Answer:

Respiratory center and vasomotor area of the cardiovascular center.

Question 5: Nervous system

Answer:

Central - brain & spinal cord Peripheral - Sensory & motor neurons Question 6: Which of the following factors have been suggested as contributing to muscle fatigue?

Answer:

• Loss of "central drive".
• Reduction in calcium release in excitation-contraction coupling.
• Reduction in muscle blood flow owing to compression of blood vessels.

-All of the above (CORRECT) Question 7: Breath-hold duration can be shortened or extended by a number of factors. How do these factors lengthen breath-hold duration?

Answer:

• increased lung inflation
• hyperventilation to lower arterial CO2 prior to breath hold
• breathing hyperoxic (high O2 concentration) gas mixtures

Question 8: Stimulation of chemoreceptors causes peripheral vasoconstriction, splenic contraction, and an increased drive to breathe. What happens during increased drive to breathe?

Answer:

Stimulation of chemoreceptors increases the drive to breathe to replenish O2 in the blood, and remove CO2 f.rom the body.Question 9: You stimulated the ulnar nerve at the level of the elbow & wrist. Then measured the latency to the onset of the contraction of the hand muscles for each. By taking the difference in the times divided by the distance between the elbow and wrist of your vol

Answer:

Conduction velocity

Question 10: True or False: The pupillary reflex is a monosynaptic reflex arc.

Answer:

False Question 11: What is the primary neurotransmitter released at the neuromuscular junction?

Answer:

Acetylcholine

Question 12: Myelinated axon

Answer:

• less electrical current lost across the membrane
• fast conduction velocity
• saltatory conduction
• high membrane resistance

-regeneration occurs at the nodes of Ranvier Question 13: The action potential causes the release of calcium ions from the ________ ________ in the muscle cell.

Answer:

sarcoplasmic reticulum Question 14: Describe any changes in pulse amplitude you observed during the simulated dive.Explain why these changes occurred.

Answer:

See a consistent decrease in amplitude throughout the dive.

Question 15: isometric contractions

Answer:

when muscles tension increases without actually shortening (pushing a wall)

Question 16: Typical reflex arc

Answer:

Stimulus activation of sensory neuron information processing in CNS activation of motor neuron response by effector

Question 17: Stimulation of chemoreceptors causes peripheral vasoconstriction, splenic contraction, and an increased drive to breathe. What happens during peripheral vasoconstriction?

Answer:

Peripheral vasoconstriction redirects blood & O2 to vital organs which conserve O2 during breath-hold

Question 18: Which statement is true during a breath-hold?

Answer:

The lung volumes decrease as more O2 is lost from the lungs than CO2 is added from the peripheral tissues.Question 19: A _______ ______ contraction is when your muscle fibers lengthen as they are actively contracting while the angle of the joint increases.

Answer:

eccentric isotonic Question 20: Which of the following statements best describes what would occur with peripheral vasoconstriction in the absence of any blood loss?

Answer:

More blood is available for the heart and brain, and increased stroke volume of the heart.

Question 21: Statements regarding RMP

Answer:

• the cell interior is more negative than the cell exterior
• Na+ / K+ maintains an uneven distribution of cations across the membrane

Question 22: Our arteries have chemoreceptors that are sensitive to both O2 and CO2. Are these chemoreceptors responsible for the break point?

Answer:

No Urge to breathe is experienced before the actual break point is reached Question 23: When performing the knee-jerk reflex, the Jendrassik maneuver resulted in a

higher kick. This was evident in the data in that:

Answer:

The compound muscle potential on the EMG trace had a greater amplitude than it did without the maneuver.