How do the lymph capillaries differ from blood capillaries?
What will be an ideal response?
Although similar to blood capillaries, lymphatic capillaries differ structurally in the following ways: (1) The endothelial cells forming the walls of lymphatic capillaries are not tightly joined. Their edges loosely overlap one another, forming flaplike minivalves. (2) Bundles of fine filaments anchor the endothelial cells to surrounding structures so that any increase in interstitial fluid volume separates the cell flaps, exposing gaps in the wall rather than causing the lymphatic capillary to collapse.
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Membrane renewal vesicles are formed by
A) the endoplasmic reticulum. B) the Golgi apparatus. C) lysosomes. D) mitochondria. E) nucleoli.
IgG antibodies
A) are found in glandular secretions.
B) bind antigens in the extracellular fluid to B cells.
C) stimulate the release of histamine and other inflammatory chemicals.
D) are the first antibody type secreted, following initial exposure to an antigen.
E) can also cross the placenta and provide passive immunity to the fetus.
Which is a characteristic of all three types of cartilage?
A) The primary cell type is the fibroblast. B) It helps anchor muscle to bone. C) It lacks direct access to the blood supply. D) The primary fiber type is elastic.
The erectile tissue that surrounds the urethra is the
A) corpus spongiosum. B) corpus cavernosum. C) penile urethra. D) membranous urethra. E) glans penis.