Question

In: Anatomy and Physiology

29. Relaxation and contraction of the ciliary muscles alter the shape of the lens by changing...

29. Relaxation and contraction of the ciliary muscles alter the shape of the lens by changing the tension on the

a. ciliary body

b. limbus

c. vitreous body

d. dilator pupillae

e. suspensory ligaments

30. A neurotransmitter

a. provides an immediate response

b. stimulates or increases a response

c. inhibits or decreases a response

d. is produced in small amounts

e. all of the above

31. Blood backflow from right ventricle to right atrium is prevented by

a. bicuspid valve

b. tricuspid valve

c. aortic semilunar valve

d. pulmonary semilunar valve

e. none of the above: this is the correct direction for blood flow

32. Lack of, or decrease in, insulin hormone receptors on cells can result in

a. hepatitis

b. type I diabetes mellitus

c. type II diabetes mellitus

d. insulin_dependant diabetes mellitus (IDDM)

e. goiter

33. The cell bodies of motor neurons that innervate skeletal muscle are located primarily

a. in the basal ganglia

b. in the gray commissure

c. in the anterior horns

d. in the posterior columns

e. outside the spinal cord

34. The muscles that reinforce the walls of the atria and allow forceful expulsion of blood from auricles are

a. trabeculae carnae

b. papillary muscles

c. chordate tendinae

d. myocardium

e. musculi pectinati (pectinate muscles)

35. All of the following are sympathetic nervous system effects EXCEPT

a. pupillary dilation

b. vasodilation of skeletal muscle blood vessels

c. bronchodilation

d. increased gastrointestinal motility

e. reduced urine output

Solutions

Expert Solution

29. Suspensory ligament_ cilliary muscle contraction leads to contraction of cilliary body thus releases tenion on suspensory ligament. This allows elastivc capsule to act unrestrained to deform the lens substance.The lens then alters its shape to become more convex.

30. All of the above _all are properties of a neuro transmiter. It is a chemical subtance released from the terminal part of axon which caused tranmision or inhibition of impulse.

31. Between rt atrium and ventricle, tricuspid valve is present which prevents back flow of blood into atrium.It has 3 leaflets.closure of this valve produces 1st heart sound.

32.Type 2 diabetes mellitus or non imsulin dependent diabetes mellitusNIDDM due to development of insulin registance. Insulin receptors are tyrosine kinase receptors in absence of which insulin will not work (can not enter into cell) even if synthesis is normal.

33.Anterior horn of spinal cord.Axons from these cell bodies innervate muscles forms lower motor neuron.posterior column is the sensory pathway ,basal ganglia is higher centre.

34. Musculi pectineti_ these are parallaly arranged in the wall of rt atrium which helps in contraction and expulsion of blood from the rt auricle(pouch like).

35.Increased GI motility,which is the function of parasympathetic system. All other are caused due to sypathetic innervation.

Sydney Mullin answered 1 year ago

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