Human Anatomy and Physiology : Help with Circulatory Proteins and Hormones
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Example Question #61 : Circulatory Physiology
Which of the following is not an effect of epinephrine on the circulatory system?
Increase heart rate
Increase cardiac muscle contractile force
Increase blood pressure
Constrict the skeletal muscle arterioles
Constrict the skeletal muscle arterioles
Epinephrine is a hormone secreted in order to facilitate "fight or flight" reactions by the body. Secretion of epinephrine from the adrenal medulla is initiated by sympathetic stimulation. Epinephrine will increase heart rate, blood pressure, and contraction force; however, the skeletal muscle arterioles will be dilated so that more blood is able to reach the muscles. The sympathetic nervous system is designed to direct blood toward skeletal muscle and the heart, and away from the digestive tract and skin.
Example Question #2 : Help With Circulatory Proteins And Hormones
Which type of hormone is likely to make its way to the nucleus of a cell or type of cell it influences?
Lipid soluble hormones
Water soluble hormones
None of these
Blood soluble hormones
Hydrophilic hormones
Lipid soluble hormones
A lipid soluble hormone is likely to make its way to the nucleus because it can easily pass through the hydrophobic membranes of cells. A water soluble protein is likely to attach to the outside of a cell and activate a signaling pathway since it cannot readily pass through the phospholipid bilayer (cell membrane). Hydrophilic hormones are the same as water soluble hormones. Fat soluble hormones must be carried by proteins through the blood.
Example Question #62 : Circulatory Physiology
If a hormone is released into the blood stream it is called a(n) __________ and its target is likely a(n) __________.
exocrine hormone . . . distant organ/gland
endocrine hormone . . . close organ/gland
endocrine hormone . . . distant organ/gland
secretory hormone . . . muscle
exocrine hormone . . . close organ/gland
endocrine hormone . . . distant organ/gland
Hormones secreted into the blood stream have the ability to travel anywhere in the body. Such hormones are endocrine hormones and they can act on organs far from their source. Substances that are secreted outside the body (or within a body cavity) are not hormones, since all hormones are released by endocrine glands into the blood. Rather, these substances are released by exocrine glands (i.e. sweat, digestive enzymes).
Example Question #4 : Help With Circulatory Proteins And Hormones
Which of the following would directly result in increased heart rate?
Norepinephrine on beta-1 receptors
Norepinephrine on alpha receptors
Epinephrine on beta-2 receptors
Norepinephrine on beta-2 receptors
Epinephrine on alpha receptors
Norepinephrine on beta-1 receptors
Norepinephrine and epinephrine (on about an equal basis) on beta-1 receptors in the heart increase heart rate and contractility (force of contraction). These hormones are released from the adrenals in response to sympathetic stimulation.
Example Question #5 : Help With Circulatory Proteins And Hormones
Which of the following is responsible for raising the heart rate from 60 to 100 bpm?
A withdrawal of parasympathetic tone
Withdrawal of sympathetic tone
Epinephrine/norepinephrine
Addition of sympathetic tone
Addition of parasympathetic tone
A withdrawal of parasympathetic tone
Moving the heart rate between 60 and 100 bpm involves only the addition and removal of parasympathetic tone. Remember, parasympathetic: rest and digest; so, to raise the heart rate, parasympathetic tone would have to be withdrawn. Sympathetic tone would not be added until the heart rate exceeds 100 bpm.
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