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Neporo4naja [7]
3 years ago
9

After circulating through the capillaries, blood returns to the left atrium.

Medicine
1 answer:
tatuchka [14]3 years ago
3 0
Pulmonary Capillaries
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Each mature sperm cell contains ______ (number) chromosomes. Upon fertilization of the secondary oocyte. It completes meiosis II
butalik [34]

Answer:

The correct answer is - 23 (haploid).

Explanation:

Each mature sperm cell is a gamete that is produced by the meiosis type of cell division. Meiosis is the cell cycle that produces four cycle with the half chromosome in number than that of the parent cell. Humans have 46 chromosomes in but as explained the sperm or the gamete have only of that which is 23.

The same goes for ovum which is form by the meiosis second process from oocyte which is basically the egg cell. Both sperm and the ovum fuse to fertilize.

Thus, the correct answer is - 23 (Haploid)

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3 years ago
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Answer:

12. B

13. B

14.  C

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Explanation:

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Integumentary system, skeletal system, muscular system, lymphatic system, respiratory system, digestive system, nervous system, endocrine system, cardiovascular system, urinary system, and reproductive systems
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Which lymphatic organ does NOT contain lymphatic nodules?
olga nikolaevna [1]

Answer:

The correct answer is option C. thymus.

Explanation:

Lymph nodules are small groups of lymphoid tissue present in the loose under the wet epithelial membranes such as the digestive system, urinary bladder, and respiratory system.

The thymus does not contain lymph nodules like other lymphatic organs such as spleen, tonsils and lymph node. However, small lymphocytes known as thymocytes are grouped together in the cortex and epithelial reticular cells can appear like nodules in the medulla.

Thus, the correct answer is option C. thymus.

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