Human Body Systems
完成条件
按索引浏览词汇表
特殊 | A | B | C | D | E | F | G | H | I | J | K | L | M | N | O | P | Q | R | S | T | U | V | W | X | Y | Z | 全部
V
VaccineA preparation that stimulates the immune system to develop protection against a disease. | |
ValveA structure that prevents blood from flowing backward. | |
VasoconstrictionThe narrowing of blood vessels, reducing blood flow near the skin and decreasing heat loss. | |
VasodilationThe widening of blood vessels, increasing blood flow near the skin and increasing heat loss. | |
VeinA blood vessel that carries blood toward the heart. | |
VilliTiny finger-like projections that increase the surface area of the small intestine for absorption. | |
VitaminAn organic nutrient required in small amounts to regulate body processes. | |