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Rima Rohit

Physiology Assignment 2 - Weeks 7-13

QuestionAnswer
Whether an impulse is continued through the neuron depends on the magnitude of the voltage in the axon hillock. True
The magnitude of the action potential peaks when the sodium channels close. True
The tiny bulge at the end of a terminal branch of a presynaptic neuron's axon is called a(n) synaptic knob.
Which membrane receptor acts to directly change ion permeability when stimulated? Gated-channel receptor
The active transport mechanism is the plasma membrane that transports sodium and potassium ions in opposite directions and at different rates is the sodium-potassium pump.
Dopamine, epinephrine, and norepinephrine are classified as: catecholamines.
Severe depression can be caused by a deficit in certain brain synapses of: amines.
The only ion(s) the can diffuse across a neuron's membrane when the neuron is at rest is (are): potassium.
Which of the following is not one of the main chemical classes of neurotransmitter? Triglycerides
Neurotransmitters are released in a synapse and bind to: receptors on the postsynaptic neuron.
The second largest part of the brain, located just below the posterior portion of the cerebrum, is the cerebellum.
Mixed cranial nerves contain axons of sensory and motor neurons.
Which region of brain plays a part in the mechanism responisble for emotions by associating sensory impulses with feelings of pleasantness and unpleasantness? Thalamus
A reflex consists of either a muscle contraction or a glandular secretion.
The groove between the frontal and parietal lobes of the cerebral cortex is the central sulcus.
Norepinephrine is liberated at: most sympathetic postganglionic nerve endings.
The part of the brain that can directly influence or inhibit the release of hormones from the pituitary is the: hypothalamus.
Sympathetic responses generally have widespread effects on the body because: preganglionic fibers synapse with several postsynaptic fibers.
What would the result be if the phrenic nerve received an impulse from the cervical plexus? The diaphragm would stop contracting.
Which of the following is not true of the knee jerk reflex? It is flexor reflex.
The receptors responsible for sensing crude and persistent touch are the: Ruffini corpuscles.
The major hormone produced by the corpus luteum is: progesterone.
The clear and potassium-rich fluid that fills the labyrinth is endolymph
The type of cells that secrete ACTH are: corticotrophs
When you are looking at a large green field, which cones would be sending the green wavelengths to the brain? M
A glycoprotein hormone that is secreted to increase oxygen concentration in the tissues is erythropoietin
The physiologicial mechanism that dissolves clots is known as fibrinolysis.
Which of the following is not a formed element found in the blood? Plasma
The molecule that makes up 95% of the dry weight of each red blood cell is responsible for the red pigment is hemoglobin
The type of membranous tissue that lines the heart and blood vessels is the endothelium
The heart begins beating in the fetus at about what stage of development? After about 4 weeks
During pregnancy, what happens to the oxygenated blood returned from the placenta via the umbilical vein? It flows into the inferior vena cava.
The term used to describe the collection of mechanism that influence the circulation of blood is: hemodynamics.
If damaged, which valve could allow blood to leak back into the right atrium? Tricuspid
Erythrocytes begin their maturation sequence in red bone marrow from nucleated cells known as: hematopoietic stem cells.
Adaptive immunity, part of the body'd third line of defense, is orchestrated by two different classes of a type of white blood cell called the lymphocyte
The movement of phagocytes from blood vessels to an inflammation site is called diapedesis
The function of which antibody is basically unknown? lgD
Complement can best be described as a(n): enzyme in blood.
Recognition of antigens by antibodies occurs when an antigen's epitopes fit into and bind to an antigen molecule's antigen-binding site.
A right shift of the oxygen-hemoglobin dissociation curve due to increased partial pressure of carbon dioxide is also known as the Bohr effect.
Pressure gradients are established by changes in the thoracic cavity.
During inspiration, as the size of the thorax increases, the intrapleural and alveolar pressures decrease.
Oxygen enters blood from the alveolar air because the partial pressure of alveolar air is greater than the partial pressure of incoming blood.
The ability of the lungs and thorax to stretch is referred to as compliance.
The ejection of bile from the gallbladder is controlled by which hormones? CCK and secretin
Fats and other nutrients in the duodenum stimulates the intestinal mucosa to release a hormone called gastric inhibitory peptide.
The wave-like ripple of the muscle layer of the GI tract is called peristalsis
The final step in lipid transport by the intestines is the formation of chylomicrons.
Saliva contains the enzyme amylase.
The process of swallowing is known as: deglutition.
Which of the following is not one of the openings that must be blocked when food moves from the pharynx into the esophagus? Oropharynx
The hormones thought to be a messenger causing release of digestive enzymes from the intestinal mucosa is: vasoactive intestinal peptide.
The purpose of peristalsis is to: propel food foward along the GI tract.
The end product of fat digestion is: glycerol.
Created by: Rima Rohit
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