Oxygen starved tissues can release chemical signals into the blood that can change the diameter of nearby blood vessels delivering oxygen and nutrients to the tissues. in doing so, the blood vessels will respond through vasodilation (widening of the vessel). which muscle type is responsible for this vasodilation?

Smooth muscles

Explanation:

Smooth muscles line the hollow internal structures such as blood vessels, airways, etc. These muscle cells lack striations and therefore, are called smooth muscle cells. The contraction of smooth muscle is involuntary and is under the regulation of the autonomic division of the nervous system and hormones.

For example, cells release vasoactive substances under the conditions of oxygen and nutrients deficiencies which in turn causes relaxation of smooth muscle cells of the blood vessels and widens them. The dilated blood vessels carry more oxygen and nutrients due to increased blood circulation in them.

d. making up measurements to record.

fertilization, pictured in figure 24.23a is the process in which gametes (an egg and sperm) fuse to form a zygote. the egg and sperm each contain one set of chromosomes. to ensure that the offspring has only one complete diploid set of chromosomes, only one sperm must fuse with one egg. in mammals, the egg is protected by a layer of extracellular matrix consisting mainly of glycoproteins called the zona pellucida. when a sperm binds to the zona pellucida, a series of biochemical events, called the acrosomal reactions, take place. in placental mammals, the acrosome contains digestive enzymes that initiate the degradation of the glycoprotein matrix protecting the egg and allowing the sperm plasma membrane to fuse with the egg plasma membrane, as illustrated in figure 24.23b. the fusion of these two membranes creates an opening through which the sperm nucleus is transferred into the ovum. the nuclear membranes of the egg and sperm break down and the two haploid genomes condense to form a diploid genome.

explanation: