Which are characteristic of leukocytes? a: Smaller than erythrocytesb: Have a nucleusc: Have no hemoglobind: More numerous than erythrocytese: Depending on type, may or may not contain granules
A. b, c, d, e
B. a, b, e
C. b, c, e
D. a, b, c, d
E. a, b, c, d, e
Answer: C
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Answer the following statement(s) true (T) or false (F)
1. Under normal circumstances, the wrist can be hyperextended, but the elbow cannot. 2. The coxal joint is a ball-and-socket joint, in which the head of the humerus articulates with the glenoid cavity of the scapula. 3. A meniscus is a type of bursa seen in the space between the femur and tibia. 4. The elbow has both pivot and hinge joints. 5. The main stabilizer of the shoulder is the biceps brachii muscle.
An action potential is regarded as an example of a positive feedback. Which of the following examples below best illustrates the positive feedback aspect of an action potential?
A) The sodium potassium pump consistently moves ions as long as ATP is available, and regardless of membrane potential changes. B) Potassium permeability is about 25 times greater than sodium ions. C) Voltage gated potassium ion channels open slowly and remain open long enough to cause hyperpolarization. D) A threshold stimulus will cause the opening of voltage gated sodium ion channels that will cause further depolarizing stimulus. This stimulus will open still more voltage gated sodium ion channels.
________ is the extracellular component of connective tissues.
Fill in the blank(s) with the appropriate word(s).
Which of the following is the name of the muscular layer of the bladder?
A. Rugae B. Detrusor C. Trigone D. Muscularis E. External urethral sphincter