Neurotransmitter action is usually brief because neurotransmitters, such as acetylcholine, are _________________
Fill in the blank(s) with the appropriate word(s)
Answer: Rapidly broken down by enzymes in the synaptic cleft
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The following is a list of the events that occur during a muscle contraction. What is the correct sequence of these events? 1. Myosin cross-bridges bind to the actin. 2. The free myosin head splits ATP. 3. Calcium ion is released from the sarcoplasmic reticulum. 4. The myosin head pivots toward the center of the sarcomere. 5. Calcium ion binds to troponin. 6. The myosin head binds an ATP molecule
and detaches from the actin. A) 1, 3, 5, 4, 6, 2 B) 5, 1, 4, 6, 2, 3 C) 3, 5, 1, 2, 4, 6 D) 3, 5, 1, 4, 6, 2 E) 1, 4, 6, 2, 3, 5
The layer of the uterine wall that is shed during menstruation is the ________.
A. vasometrium B. myometrium C. perimetrium D. endometrium E. hymen
In the figure showing an anterior view of the arteries, which number indicates the left internal carotid artery?
A. 1 B. 2 C. 3 D. 4 E. 5
Bowel and bladder control involve spinal reflex arcs that are located in the sacral region of the spinal cord. In both instances two sphincter muscles, an internal sphincter of smooth muscle and an external sphincter of skeletal muscle, control the passageway out of the body. How would a transection of the spinal cord at the L1 level affect an individual's bowel and urinary bladder control?
What will be an ideal response?