When a person hyperventilates, there are lower than normal levels of PCO2 and hydrogen ion in arterial blood, a condition called respiratory alkalosis.
Answer the following statement true (T) or false (F)
True
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Choose the correct description of a typical medium-sized vein.
A) In these vessels, the thin tunica media is surrounded by a thick tunica externa composed of mostly collagen fibers. B) Ranging from 2 mm to 9 mm in diameter, its thin tunica media consists of one to two layers of smooth muscle cells. C) It has a diameter of approximately 0.4 cm and has more smooth muscle cells and fewer elastic fibers. D) It ranges from 2 mm to 9 mm in diameter, and the relatively thick tunica externa has longitudinal bundles of elastic and collagen fibers. E) It has a diameter up to 2.5 cm, and its tunica media is dominated by elastic fibers rather than smooth muscle cells.
The first event in muscle fiber contraction is that
A) the muscle fiber membrane is stimulated and a muscle impulse travels deep into the fiber through transverse tubules. B) acetylcholine diffuses across a gap at a neuromuscular junction. C) calcium ions diffuse from sarcoplasmic reticulum into the sarcoplasm and bind to troponin molecules. D) acetylcholine is released from the end of the motor neuron.
A piece of gauze can be used to make a cat muzzle
Indicate whether the statement is true or false
The female pelvis typically has which of the following characteristics?
a. narrow, U-shaped greater sciatic notch b. wide subpubic angle, greater than 100 degrees c. short, triangular pubic body d. smaller, heart-shaped pelvic inlet