capacitation

[kah-pas″ĭta´shun] the process by which the glycoprotein coat and the seminal proteins are removed from the surface of the sperm's acrosome by substances secreted by the uterus or fallopian tubes of the female genital tract, thereby permitting the reaction" >acrosome reaction to occur.

ca·pac·i·ta·tion

(kă-pas'i-tā'shŭn), Capacitation is a process whereby the glycoprotein coat is modified and seminal proteins are removed from the surface of the sperm. There are no morphologic changes. Capacitation also occurs in in vitro fertilization; after capacitation, the acrosomal reaction can occur. [L. capacitas, fr. capax, capable of]

capacitation

A biochemical event in mammals that consists of the post-ejaculation maturation of sperm, which are capable of penetrating the zona pellucida and fertilising an oocyte. Capacitation is due to exposure to secretions—sterol binding albumin, lipoproteins, proteases and glycosidases—in the uterus, and requires the correct concentration of the tripeptide fertilisation promoting peptide, which is present in seminal fluid. Capacitation destabilises the acrosomal sperm-head membrane, facilitating binding of a sperm to the oocyte by removing steroids (e.g., cholesterol) and non-covalently bound seminal glycoprotein; the process is reversible and includes all of the events up to the acrosome reaction, which is irreversible.

capacitation

Reproductive medicine The postrelease maturation in sperm, which are capable of penetrating the zona pellucida and fertilizing an oocyte after exposure to secretions in the ♀ genital tract. Cf Acrosome reaction.

ca·pac·i·ta·tion

(kă-pas'i-tā'shŭn) A conditioning process whereby the glycoprotein coat and seminal proteins are removed from the acrosome of a sperm. After capacitation has occurred, perforations develop in the acrosome. [L. capacitas, fr. capax, capable of]

capacitation

changes occurring in SPERM while inside the female reproductive tract, where the acidic environment causes alterations to the cell membrane of the sperm that make possible its adhesion to the secondary OOCYTE.

单词	capacitation
释义	capacitation capacitation [kə‚pas·ə′tā·shən] (physiology) The process of physiological change occurring in mammalian spermatozoa during passage through the female reproductive tract that enables them to penetrate the egg membrane. capacitation capacitation [kah-pas″ĭta´shun] the process by which the glycoprotein coat and the seminal proteins are removed from the surface of the sperm's acrosome by substances secreted by the uterus or fallopian tubes of the female genital tract, thereby permitting the reaction" >acrosome reaction to occur. ca·pac·i·ta·tion (kă-pas'i-tā'shŭn), Capacitation is a process whereby the glycoprotein coat is modified and seminal proteins are removed from the surface of the sperm. There are no morphologic changes. Capacitation also occurs in in vitro fertilization; after capacitation, the acrosomal reaction can occur. [L. capacitas, fr. capax, capable of] capacitation A biochemical event in mammals that consists of the post-ejaculation maturation of sperm, which are capable of penetrating the zona pellucida and fertilising an oocyte. Capacitation is due to exposure to secretions—sterol binding albumin, lipoproteins, proteases and glycosidases—in the uterus, and requires the correct concentration of the tripeptide fertilisation promoting peptide, which is present in seminal fluid. Capacitation destabilises the acrosomal sperm-head membrane, facilitating binding of a sperm to the oocyte by removing steroids (e.g., cholesterol) and non-covalently bound seminal glycoprotein; the process is reversible and includes all of the events up to the acrosome reaction, which is irreversible. capacitation Reproductive medicine The postrelease maturation in sperm, which are capable of penetrating the zona pellucida and fertilizing an oocyte after exposure to secretions in the ♀ genital tract. Cf Acrosome reaction. ca·pac·i·ta·tion (kă-pas'i-tā'shŭn) A conditioning process whereby the glycoprotein coat and seminal proteins are removed from the acrosome of a sperm. After capacitation has occurred, perforations develop in the acrosome. [L. capacitas, fr. capax, capable of] capacitation changes occurring in SPERM while inside the female reproductive tract, where the acidic environment causes alterations to the cell membrane of the sperm that make possible its adhesion to the secondary OOCYTE.
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