Falls are the most common cause of traumatic brain injury, and falling poses an especially serious risk for older adults. When a senior sustains a traumatic brain injury in a fall, direct effects of the injury may result in long-term cognitive changes, reduced ability to function and changes in emotional health.
Asexual reproduction is by means of spores produced in sporangia borne on the hyphae. Zygomycota get their name from the production of thick-walled sexual structures called zygosporangia, which can remain dormant for long periods.
Multicellular gametangia Plant gametophytes produce gametes within multicellular organs called gametangia. A female gametangium, called an archegonium, produces a single egg cell in a vase-shaped organ. The egg is retained within the base. Male gametangia, called antheridia, produce and release sperm into the environment. In many major groups of living plants, the sperm have flagella and swim to the eggs though a water film. Each egg is fertilized within an archegonium, where the zygote develops into the embryo.