a. None of the antigens are found in ____ blood group.
b. Difficulty in birth occurs due to the lack of _____.
c. The blood vessel that removes deoxygenated blood from the heart muscle________.
d. Difficulty in birth occurs due to the lack of_________.
e. The central portion of spinal cord is filled with________.
f. Myelin sheath helps a neurone to transmit messages_______.
Answers
Explanition
1.type AB blood have both A and B antigens, whereas people with type O blood have no antigens present (there is no antigen)
2.
The primary cause is premature birth, being born before 37 weeks gestation; a baby born early has less time in the mother's uterus to grow and gain weight, and much of a fetus's weight is gained during the latter part of the mother's pregnancy. Another cause of low birthweight is intrauterine growth restriction
3.The coronary arteries derive from the aorta and run along the surface of the heart and within the muscle to deliver oxygen-rich blood to the myocardium. The coronary veins remove deoxygenated blood from the heart muscle, returning it through the coronary sinus into the right atrium.
4.same as 2nd Question
5Internal to this peripheral region is the grey matter, which contains the nerve cell bodies arranged in the three grey columns that give the region its butterfly-shape. This central region surrounds the central canal, which is an extension of the fourth ventricle and contains cerebrospinal fluid
6.Myelin is an insulating layer, or sheath that forms around nerves, including those in the brain and spinal cord. It is made up of protein and fatty substances. This myelin sheath allows electrical impulses to transmit quickly and efficiently along the nerve cells.
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