The parathyroid glands are small endocrine glands in the neck of humans and other tetrapods that produce parathyroid hormone. Humans usually have four parathyroid glands, variably located on the back of the thyroid gland, although considerable variation exists.Parathyroid hormone and calcitonin (one of the hormones made by the thyroid gland) have key roles in regulating the amount of calcium in the blood and within the bones.he parathyroid glands are two pairs of glands usually positioned behind the left and right lobes of the thyroid. Each gland is a yellowish-brown flat ovoid that resembles a lentil seed, usually about 6 mm long and 3 to 4 mm wide, and 1 to 2 mm anteroposteriorly. There are typically four parathyroid glands.
The life cycle of the ladybug is between four to six weeks. In the spring the adults lay up to three hundred eggs in an aphid colony. The eggs hatch in two to five days. The newly hatched larvae feed on aphids for up to three weeks, and then they enter the pupa stage.The adult ladybug emerges about a week later. However, they usually do not have their spots for their first 24 hours of adulthood.There may be as many as six generations of ladybugs hatched in a year.he life cycle of the ladybug is between four to six weeks. In the spring the adults lay up to three hundred eggs in an aphid colony. The eggs hatch in two to five days. The newly hatched larvae feed on aphids for up to three weeks, and then they enter the pupa stage.
The life cycle of a ladybug (egg to mature adult) takes 4 to 8 weeks. As adults, most ladybugs live 1 year and can eat 5,000 aphids in their lifetime. They also go through diapause or hibernate (up to 9 months) to survive the cold temperatures of winter (below 55 degrees).