Secretes chemicals that reach their targets through the bloodstream.
Which of the following is a regulatory protein associated with membrane-bound receptor molecules?
When a few intracellular mediator molecules activate several enzymes, and each of these activated enzymes activate still other enzymes, the hormone has initiated
A cascade effect
Diffuse easily through the plasma membrane.
Regulates the secretory activity of the pituitary gland.
The 2 functional portions of te pituitary gland are the
Neurohypophysis and adenohypophysis
The hypothalamohypophysial portal system carries hormones from the
Hypothalamus to the anterior pituitary
ADH is secreted in response to
Increase osmotic pressure or the body fluids
Which hormone is sometimes given to women to induce labor? ?
Is stored and released from the posterior pituitary
Which if te following will inhibit the secretion of growth hormone?
Growth hormone-inhibiting hormone (GHIH)
What is it about a cell that identifies it as a target cell for a hormone?
The presence of a receptor specific for that hormone
If growth hormone (GH) secretion is deficient in a newborn, the child will
Probably experience reduced none growth
What do all hormones have in common?
They bind to and interact with a receptor in the targe cell.
In general, the response if target cells to endocrine stimulation is___ than their response to nervous stimulation.
Slower and more prolonged
Which of the following performs both endocrine and exocrine functions?
Members of which group of hormones are made from cholesterol?
An example if a situation where the nervous system regulates the rate if hormonal secretion is when
Sympathetic neurons stimulate te release of epinephrine.
Produces an increase in sensitivity of the target cell to the hormone.
Receptors for the most part water-soluble hormones are located
On the plasma membrane of their target cells
Parathyroid hormone (PTH)
Allows the kidneys to retain calcium.
The rate if secretion of parathyroid hormone increases when
Serum calcium levels decrease.
Julie was diagnosed with and aggressive tumor of the thyroid. Surgery was performed to remove te thyroid. However, post-operatively, Julie's blood calcium levels began decling to life-threating levels. This decline is most likely due to
Accidental removal is the parathyroid gland during surgery.
The endocrine glands located in top of the kidneys are the
Which of these hormones is NOT secreted by the adrenal cortex?
The primary stimulus for release of the adrenal medullary hormones come from
The sympathetic nervous system.
The major secretory products of the zona glomerulosa of the adrenal cortex are
Stimulate growth of public hairs in females.
High blood glucose levels cause an increased secretion of
Which of the following functions is associated with the blood?
Delivery of oxygen to tissue cells.
A blood clot that forms when a blood vessel is cut off is an example of blood functioning in
Which of the following plasma is most abundant?
Functions of plasma proteins include
Regulation of osmotic pressure.
The only formed elements that possess a nucleus when mature are the
Give rise to formed elects in the blood.
Contain hemoglobin in their cytoplasm.
Transports oxygen in the blood.
Which of the following cell types in an immature red blood cell?
Which of the following would lead to increases eryrhripoiesis?
Increases erythropoietin levels
When defective erythrocytes are broken down,
Bilirubin is formed from the breakdown of hemoglobin.
In adults, red blood cells are made in one place, spend most of their lifespan in another, and most are finally destroyed in yet another place. Which choice lists these in the correct chronilogical order?
Bone marrow; blood vessels; spleen
Which of the following statements reguarding Leukocytes is TRUE?
Leukocytes are the largest of the formed elements.
Which of the following is an agranulocyte?
Migrate to lymphatic tissue.
When a person develops a sore throat, white blood cells are drawn to the area of infection by a process called
During platelet plug formation
Platelets stick to the exposed collagen fibers of injured vessels.
Which of the following events is one I the three main stages if coagulation?
Conversion of fibrinogen to fibrin
In the extrinsic pathway, damages tissue release
Tissues factor (TF).
The function of plasmin is to
Fibrinolysis is responsible for
A blood clot attached to a blood vessel wall is called a(an)
When the antigens on erythrobnind with antibodies in the plasma
Agglutination of erythrocytes occurs.
Agglutination of red blood cells means
They clump together.
A person with type O blood should receive a blood transfusion from a donor with
Type O blood.
RhoGam injections are given to
Prevent sensitization of the mother.
In hemolytic disease of the newborn,
Antibodies from the mother cross the placenta and affect the fetus.
Is a potent anticoagulant.
When large quantities of blood are lost, erythrocytes must be replaced to restore
Type AB blood
Has both A and B antigens on the red blood cells.
The pericardial sac is lined with
Covers the surface of the heart.
Blood vessels enter and exit from the ___ of the heart.
The gem rest cardiac vein and middle cardiac bein empty into a venous cavity called the
Which of these statements is true? (Cardiovascular)
The great cardiac vein collects blood from the anterior surface of the heart.
The AV valve that is located on the same side of the heart and the origin of the aorta is the
Bicuspid or mitral valve.
Contractin of the papillary muscles would
Prevent he AV valves from protruding into the atria.
Action potentials pass from one myocardial cell to another through areas of low electrical resistance called
The cardiac electrical impulse normally begins spontaneously in the SA node because
This area depolarizers more rapidly than anyother portion if the conduction system.
Te spontaneous opening of sodium fast channels marks the beginning of ___ of a myocardial cell.
The plaetau phase seen during the action potential of a cardiac muscle cell is due to the
Opening of calcium slow channels.
The period of time in which the myocardium is insensitive to further stimulation is caled the
Absolute refractory period.
In a normal electocardiogram, the
QRS complex results from ventricular depolarization.
Contraction of the ventricles is referred to as ventricular
In the cardiac cycle,
The two atria relax while the two ventricles contract.
The period of isovolumic contrsction is immediately followed by
The period of ejection
Pressure in the right ventricle must exceed pressure in the ___ before the right ventricle can eject blood.
The charmer of the heart that endures the highest pressure is the
The tricuspid valve is closed
What occurs during the time between the first heart sound and the second heart sound?
Systemic blood vessels transport blood
From left ventricle through the body to the right atrium.
What is the order if the blood vessels that a red blood cell would pass through as the blood leaves the heart, travels to a tissue, and then returns to the heart?
Artery, arteriole, capillary, venule, vein
The lining of a capillary is called the
The exchange of nutrients and gases between the blood tissue cells is the primary function of
Have a wall where the endothelial cells fit very tightly together.
Which of the following organs would be most likely to contain fenestrated capillaries?
Control the blood flow into capillary beds.
What vessel provides a bypass for a capillary bed?
Blood is moved through the vascular system by
Pressure gradients created by the heart.
In a capillary bed, relaxation of the precapillary sphincter
Occurs when the tissue in the area needs more oxygen.
Which coat of an artery contains endothelium?
Arteries can constrict or dilate as needed because of the smooth muscle found in the
Te blood vessels that are under the greatest pressure are the
Contain a thick tunica media.
From the heart to body tissues, which of the following sequences of vesicles is correct?