What is the blood-testis barrier and how does it function?
What will be an ideal response?
The blood-testis barrier isolates the seminiferous tubules from the general circulation in a fashion comparable to the blood-brain barrier. Extensions of the nurse cells form a layer that surrounds the seminiferous tubules between the spermatogonia and the tubular capsule. Transport across the nurse cells is tightly regulated so that conditions inside the lumen of the seminiferous tubules remain stable. The tubules are filled with fluid different in composition from interstitial fluids, being higher in androgens, estrogens, potassium, and amino acids. The blood-testis barrier preserves these differences, as well as preserving the sperm-specific antigens in the plasmalemmas of the developing spermatozoa.
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________ is the amount of air moved into or out of the lungs at rest in a single breath.
A. Inspiratory reserve volume B. Vital capacity C. Tidal volume D. Expiratory reserve volume
Which type of membrane proteins can catalyze chemical reactions on the inner or outer surfaces of the plasma membrane?
A. Enzymes B. Carrier proteins C. Marker molecules D. Receptor proteins E. Channel protein
Which of the following is Not true about isotopes?
A. Isotopes are two or more forms of the same element B. Isotopes have different atomic numbers C. Isotopes have different mass numbers D. Some isotopes are radioactive
Which is the most immediate source of energy for the body?
A. Glycogen B. Any sugar C. Amino acids D. Glucose