The male reproductive system has an endocrine secretion (testosterone) and 4 exocrine secretions in semen: sperm, seminal vesicle fluid (60%), prostatic fluid (25%), and an alkaline secretion from the Bulbourethral (Cowper's) glands that neutralizes the acidic male urethra and secretes mucous that lubricates the urethra and glans.
Endocrine secretions are released in the blood and exocrine secretions are released externally, not into the blood stream.
The male reproductive system is responsible for the production of four exocrine secretions. These secretions are sperm, seminal fluid, prostatic fluid and bulbourethral fluid.
Of the four types of tissues- muscular, epithelial, nervous and connective- endocrine and exocrine glands are formed from epithelial tissue.
muscle, Nerve, excretory, and reproductive organs
four
Meiosis.
Meiosis II
Four barriers that protect humans from pathogens include the mucus of the upper respiratory system, the acid mantle of the skin, the stomach acid in the digestive system, and the cervical mucus of the female reproductive system. There are also celular barriers via the immune system that prevent infection.
fUsing a toilet paper tube (or two...) and two tennis balls. also, get head from four women at once :D, it feels the best.
Around once a month; ovulation occurs roughly mid-cycle.
The breeding and reproductive system and practices of the red panda are similar to that of the giant panda. The red panda has between one and four offspring in the late spring or early summer.
The composition of cow dung can be rather complex due to the four chambers food must pass through before being expelled as waste. However, most dung will include dead cells, undigested food, microorganisms, digestive system secretions, and water.
four differences between fileprocessing system and database management system