Tag: human excretory organs
Questions Related to human excretory organs
Which one is an accessory excretory organ?
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Liver
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Stomach
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Intestine
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Heart
The urinary bladder is muscular and is under ............ control.
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Muscular
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Mechanical
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Nervous
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Hormonal
The urinary bladder is made up of several detrusor muscles which mainly expands and contracts by the signals received by the autonomic nervous system. Parasympathetic nerves from the S2, S3 and S4 levels of spinal cord cause the upper part of the bladder to contract and bladder neck to relax, assisting in the process of micturition (urination). Sympathetic nerves from the $T _{11}$-$L _2$ levels of spinal cord do the opposite, causing the upper section of the bladder to relax and the bladder neck to contract, ensuring urine storage.
Which one is not supplied exclusively with involuntary muscles?
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Iris
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Gland ducts
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Urethra
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Coats of blood vessels
Iris is supplied by involuntary muscles which contract or relax in response to photo stimuli. Gland ducts have muscles in their walls and in the form of sphincters which are involuntary. Coats of blood vessels also have a muscle layer sandwiched between two other layers. Urethra has two sphincters of which one is involuntary and one is voluntary. Hence, urethra is not exclusively supplied with involuntary muscles.
The wall of urinary bladder has a thick layer of smooth muscle called
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Dartos
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Detrusor
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Deltoid
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Depressor
a) Dartos muscle is a muscle present in the scrotal sac.
Which of the following is true for Neurilemma?
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Discontinuous at nodes of Ranvier
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Continuous at nodes of Ranvier and made by schwann cells
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Discontinuous at nodes of Ranvier and made by schwann cells
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Continuous at nodes of Ranvier and made by oligodendrocytes
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