Blood/Circulation Multiple Choice 19. Blood and Blood Cells: Which statement is
ID: 189022 • Letter: B
Question
Blood/Circulation Multiple Choice 19. Blood and Blood Cells: Which statement is FALSE? a. Fish blood is composed of blood cells suspended in plasma that is circulated through the body tissues Plasma transports a variety of materials, including: cells, dissolved gases, inorganic ions, and numerous organic constituents such as hormones, vitamins, and several plasma proteins are nucleated blood cells which carry the red-pigmented protein hemoglobin; their primary function is the transport of gases throughout the body. RBC/hemoglobin transport oxygen from the gills to the tissues. RBC densities can range from 500 Leukosyctes (WBCs; several types) are non-pigmented, nucleated blood cells whose primary function is to defend the body against microorganisms/infection; WBCs do much work outside of the circulatory system, passing through the wals of small blood vessels. ,000/mm to 4 million/mm c. d. In hagfishes and lampreys, the pituitary gland (anterior lobe) and liver are the primary hemopoietic sites e. Neural stimulation of spleen (e.g., elasmobranchs, teleosts) via the sympathetic nervous system for RBCs and certain WBCs; in larvae, the yolk sack is important site of lymphocyte (WBC) production. promotes contraction of the spleen - causing spleen to release RBCs to the circulation during stressful fight-or-flight" situations (e.g., severe exercise, hypoxia), neural stimulation can also increase the heat rate and blood pressure and mobilizes glucose in the liver. True or False 20. Hemoglobin (Hb) -a circulating respiratory pigment- is composed of a colorless protein, globin, and an iron-containing red pigment, heme (responsible for red color of oxygenated blood). Oxygen content of blood is greatly increased, because O2 combines w/ Hb. Without Hb, the O content of blood would be very low; it has been reported that the combination of O, w/ Hb results in a -70-fold increase in blood-oxygen content. a. True b. False 21. Marine bony fishes in the family Channichthyidae (erocodile icefishes IAntaretic ieefishes) do not have hemoglobin in their blood. a. True b. False Multiple Choice 22. Hemoglobin's oxygen affinity (Hb-02 affinity) is - in respiring tissues a. increased b. reduced c. not affected 23. Theis when the saturation capacity of hemoglobin is affected by pH or the partial pressure of Co or as pH decreases, the hemoglobin responds with a diminished capacity to bind oxys a. Bohr effect b. Root effect c. Cope effect d. Agasizz effect e. Butterfly effectExplanation / Answer
19 d is false. In lampreys and Hagfishes the Kidney is the main hematopoetic site
20 True.
Most of the oxygen in the blood is carried as a reversibly bound form with hemoglobin(upto 98%) hence hemoglobin is a very important protein, the lack of which can cause anaemia.
21 a True. These fishes lost their RBCs and hemoglobin and are the only vertebrates which show this. They manage to survive as their gills and extremely thin skin allows for oxygen to diffuse through.
22 b reduced. In these tissues such as muscle where oxygen is required, dissociation of Hb-O2 leads to more availibility of Oxygen.
23 a Bohr effect. This is the standard theory of Bohr effect