Answer:
Glands may be classified in a variety of ways. Perhaps the most basic is classifying glands as either “exocrine” (secretion into a lumen or onto a surface) or “endocrine” (secretion into the circulation via capillaries).
Explanation:
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Answer:
Spermatogonia , Primary Spermatocyte, Secondary Spermatocyte, Spermatids and Spermatozoa.
Explanation:
Seminiferous tubules are the main site for spermiogenesis. The two main cells included in the seminiferous tubules are germ cells which produce sperms another one is the Sertoli cells which nurture the germ cells throughout the developement process.
There are 3different phases described below:
1. Proliferative Phase: Spermatogonia i the basal region of the tubular epithelium undergo mitosis. Spermatogonia divide to give rise to primary spermatocytes. All descendants of a B spermatogonium remain connected by cytoplasmic bridges, forming a syncytium - like cell clone which undergoes synchronous development.
2. Meiotic Phase:Each primary spermatocyte divides to give rise to two short-lived secondary spermatocytes, which in turn give rise to two spermatids each. The spermatids contain a haploid number of chromosomes (half the number of a somatic cell). Primary spermatocytes are the largest cells in the spermatogenic series and are located approximately midway within the seminiferous epithelium.The process of meiosis occurs over a long period, with prophase of the first meiotic division taking up to three weeks
3. Differentiation phase
This phase is also known as spermiogenesis.
Spermatids undergo transformation into spermatozoa. Many changes occur within the cells, the three major ones being:
i) formation of the acrosome, which covers the cranial part of the head. The acrosome will contain hydrolytic enzymes to allow fusion of sperm and egg for fertilisation.
ii) condensation of nuclear chromatin in the head to form a dark-staining structure
iii) growth of the tail opposite the acrosome, and loss of excess cytoplasmic material which is shed as a residual body. The body is phagoctosed by the Sertoli cells..
Answer:
C. Stimulating uptake
Explanation:
Also known to (like cocaine) block reuptake of neurotransmitters and can interfere with degradation of neurotransmitters in the synaptic cleft.
