Answer the following statements true (T) or false (F)
1. The matrix of the blood, which has a density only slightly greater than water is called serum.
2. Blood cells and blood cell components suspended in the matrix are collectively called the formed elements.
3. Small packets of cytoplasm that contain enzymes and factors important in blood clotting are called platelets.
4. Neutrophils are the most abundant formed elements in the blood.
5. Platelets are components of the immune system.
1. FALSE
2. TRUE
3. TRUE
4. FALSE
5. FALSE
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Which of the following statements about the refractory period of a membrane is TRUE?
A. The refractory period places an upper limit on the frequency with which a nerve cell can conduct action potentials. B. The refractory period prevents the action potential from spreading back over the part of the membrane that just underwent an action potential. C. The absolute refractory period refers to the period of time during which another action potential cannot be initiated in that part of the membrane that is undergoing an action potential, no matter how great the strength of the stimulus. D. The relative refractory period refers to the period of time during which another action potential can be initiated in that part of the membrane that has just undergone an action potential if a stronger than normal stimulus is applied. E. All of the answer choices are correct.
The spinal nerves enter and exit the vertebral canal through the
A) dorsal root. B) ventral root. C) transverse foramen. D) vertebral foramen. E) intervertebral foramen.
The right half of the heart pumps blood through the ____ circuit and the left half pumps blood through the ____ circuit
a. systolic, diastolic. b. coronary, pulmonary. c. systemic, pulmonary. d. pulmonary, systemic. e. systemic, coronary.
Local control of blood flow
A. occurs because of contraction or relaxation of precapillary sphincters. B. causes precapillary sphincters to contract when carbon dioxide levels decrease in tissue spaces. C. causes an increase in blood flow when oxygen levels increase in tissue spaces. D. Occurs because of contraction or relaxation of precapillary sphincters and causes an increase in blood . flow when oxygen levels increase in tissue spaces are both true statements. E. All of these are true statements.