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This seminal fluid combines with the sperm, prostatic fluid from the prostate gland, and mucus secreted by the Cowper’s glands to form semen, which is discharged from the urethra during ejaculation. ● Ejaculation ● The penis is normally flaccid or soft, but when excited, blood is pumped into it at high pressure making it larger and stiffer. This also allows sperm to pass from the testis to the outside world in an ejaculation. seminal vesicle bladder rectum pubic bone prostate gland urethra Cowper’s gland penis anus vas deferens (sperm duct) scrotum epididymis testis Front view bladder seminal vesicle prostate gland vas deferens (sperm duct) epididymis © Diagram Visual Information Ltd.

Roughly the shape and size of a small pear when the woman is not pregnant, it can swell to many times this in the final stages of pregnancy. ● The cervix leads from the uterus into the vagina, which connects with the outside world. ● funnel of fallopian tube bladder uterus pubic bone cervix urethra rectum clitoris vagina vaginal opening anus External structures Front view The external structures of the reproductive system in females are simpler than the male. The opening of the vagina is bounded by a number of flaps of tissue called the labia.

Within the chloroplasts are disk-shaped membrane structures called thylakoids, which contain the chlorophyll needed for photosynthesis. Chloroplasts are made up of stacks of these disks called grana (see middle diagram). ● 4 1 2 3 4 5 Sunlight energy Carbon dioxide Water Glucose Oxygen 5 chloroplast Simple equation for photosynthesis sunlight energy 6CO2 + 6H2O C6H12O6 + 6O2 chlorophyll Light-dependent reaction The light-dependent reaction (LDR), also called photolysis, captures energy in light (bottom diagram 1) and converts it into chemical energy in the form of adenosine triphosphate (ATP) and nicotinamide adenine dinucleotide phosphate (NADP).

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