A couple comes to the physician for advice about contraception and family planning. The physician provides advice about various methods of birth control. While discussing the option of using an intrauterine device, a discussion of the process of implantation comes up. At what stage of embryonic development does am embryo normally begin to implant in the endometrium?

(A)Blastocyst
(B)Four-cell stage
(C)Morula
(D)Trilaminar embryo
(E)Zygote

Answer: (A) Blastocyst

Anatomy

The muscle weakness of myasthenia gravis results from
Which statement about excitation-contraction coupling is incorrect?
At rest, active sites on the actin are blocked by
A t rest, the tropomyosin molecule is held in place by
Which of the following statements about the action potential is false?
Which of the following interactions between electrical and chemical gradients does not lead to the establishment of a neuron's resting potential?
The myelin sheath that covers many CNSaxons is formed by
_____ are the most numerous type of neuron in the CNS.
Recognized neuronal circuit patterns include all of the following,except:
The layer of connective tissue that surrounds individual axons within a peripheral nerve is termed the
The postganglionic fibers that connect an autonomic ganglion in the thoracic or lumbar region with the spinal nerve and contain post ganglionic fibers that innervate glands in the body wall or limbs are:
The preganglionic fibers that connect a spinal nerve with an autonomic ganglion in the thoracic and lumbar region of the spinal cord and carries visceral motor fibers that are myelinated form the
The outermost connective- tissue covering of nerves is the
The white matter of the spinal cord is mainly
The subdural space lies between
The ventral root of a spinal nerve contains
The dorsal root of a spinal nerve contains
The dorsal root ganglia mainly contain
Which of these is NOT a function of the meniscus of the knee?
Which ligament unlocks the knee joint to allow the knee to initiate flexion?
On the proximal tibia There is cartilage covered areas on the superior surface, This surface is separated by a bony bridge, between the two menisci's, what is this structure called?
What are the bones of the knee joint?
What are the synovial joints involved with the Knee joint?
What is considered the largest most complex synovial joint in the body?
When it comes to the femur what is the difference between males and females?

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On physical examination, the upper body of a 7-year old boy appears much more developed than his lower body. Blood pressure in the upper extremities exceeds that that of the lower extremities. On cardiac examination, there is a midsystolic murmur over the anterior chest and back. The child's lower extremities are cold,and femoral pulses are absent. The part of the vascular system that is affected in this disorder is derived from which of the following embryologic structures?
A 38-year-old woman slips on an icy sidewalk and falls, hitting the ground with her right her right elbow. She reports that she is experiencing severe pain in her hand at the wrist. She has diminish sensation on the lateral portion of the dorsum of her hand. Which of the following is the most likely site of her fracture?
A 58-year-old man with lymphoma has shortness of breath and chest pain. A chest x-ray shows bilateral blunting of the costophrenic angle. A thoracocentesis is performed. During this procedure, it is important to pass the needle immediately above the rib to prevent damage to which of the following structures in the subcostal groove?
An infant is brought to the emergency department with a temperature of 40C(104F). The physician notes that the infant has a "bulging anterior fontanelle". The third-year medical student reads the physician's note and want to evaluate this physical finding, but she forgot where the anterior fontanelle is. In evaluating this finding, the medical student should look for which of the following anatomic landmarks?
A newborn boy does not pass meconium until 48 hours after his birth. Several weeks later his mother complains that he has not passing stool regularly. Anorectal manometry reveals increased on rectal distention with a balloon. The patient's disorder may be attributed to
A 63-year-old man has blood streaked stools and constipation. Barium enema shows a right-sided obstructing lesion. Surgery is performed, and pathologic evaluation reveals a well-differentiated, colonic adenocarcinoma. Observation of a hematoxylin and eosin-stained microscopic slide from the specimen reveals that the nuclei of the cell are blue. What is the basis for this observation ?

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